Re: [R] OT: did the wildfires affect tolstoy.newcastle.edu.au?
Carl Witthoft wrote: Just jumping to conclusions since the site is down as I type (7PM EST). What's the news from that part of Australia -- thus showing my complete ignorance of DownUnder geography. Hi Carl, The big fires are hundreds of kilometers from Newcastle, although there was a bushfire about 60 km west of there yesterday, I think. It's currently raining in Newcastle, so tolstoy may be flooded... Jim __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] summary statistics
William Revelle wrote: At 6:41 PM -0500 2/9/09, David Winsemius wrote: describe() in Hmisc provides much of the rest of what you asked for: describe(pref900$TCHDL) pref900$TCHDL n missing uniqueMean .05 .10 .25 .50 .75 .90 .95 9061904469 16051 4.123 2.320 2.557 3.061 3.841 4.886 6.054 6.867 lowest : 0.9342 1.0200 1.0522 1.1008 1.1061, highest: 19.8696 20.1667 20.7619 21.6364 21.7200 As does describe in the psych package describe(sat.act) describe(sat.act) var n mean sd median trimmedmad min max range skew kurtosis se gender 1 700 1.65 0.48 21.68 0.00 1 2 1 -0.61-1.62 0.02 education 2 700 3.16 1.43 33.31 1.48 0 5 5 -0.68-0.07 0.05 age 3 700 25.59 9.50 22 23.86 5.93 13 6552 1.64 2.42 0.36 ACT 4 700 28.55 4.82 29 28.84 4.45 3 3633 -0.66 0.53 0.18 SATV5 700 612.23 112.90620 619.45 118.61 200 800 600 -0.64 0.33 4.27 SATQ6 687 610.22 115.64620 617.25 118.61 200 800 600 -0.59-0.02 4.41 see also describe.by to break this down by some grouping variable. Bill On Feb 9, 2009, at 6:04 PM, phoebe kong wrote: Hi all, I'm wondering if there is a function that can return summary statistics: N=total number of observation, # missing, mean, median, range, standard deviation. As I know, summary() returns some of info I've mentioned above. Thanks, SY and if you want to roll your own descriptive stats, the describe function in the prettyR package (confusing, isn't it?) Jim __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Help on BarPlot
Hi, #There are a lot of examples for barplot if you just type example(barplot) # i altered one slightly to put the values on top of each bar mp - barplot(VADeaths) # default #tot - colMeans(VADeaths) #changed this line tot = colSums(VADeaths)#wether you need max, min, mean , colSums will depend on your data text(mp, tot + 4, format(tot), xpd = TRUE, col = blue) #you should be able to get it from here Thomas Steve Sidney schrieb: Dear all As a new user of R, can someone please help me with the following I have created a programme to analyse laboratory data and one of the graphs is a bar plot of 'Z' scores. On the bar plot I am using the following line to plot some results barplot (zb[,c(ZBW)], ylim = c(-6,6), names.arg=zb[,c(LabNo)],xlab=Lab Code Number, cex.names = .5 , axis.lty=1 , main = Total Coliform ) What I would like to do is move the xlab parameter to sit on top or on each bar and not on the x-axis at y=0. Any help would be appreciated. Thanks Steve [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] twitter useRs?
Hi José, I wonder if there are any useRs sharing day-to-day realizations/tricks on twitter... Seems like a good place for those things that are good findings, but one is too lazy to blog about them... I don't twitter, but I wrote an R package to read and write tweets from the R command line for twitter and laconi.ca. I will submit it soon, but if anyone is interested contact me off-list. Best, Tobias __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Replacing dot with empty space
Hello, everyone
How do I replace dot with empty space in ED4.Comdty?
I need to get ED4 Comdty
tried sub() in many different ways, like sub({.}, , ED4.Comdty)
etc but could not do it.
Thanks in advance,
Sergey
__
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] Replacing dot with empty space
OK, got it now:
sub([.], , ED4.Comdty)
On Tue, Feb 10, 2009 at 10:01, Sergey Goriatchev serg...@gmail.com wrote:
Hello, everyone
How do I replace dot with empty space in ED4.Comdty?
I need to get ED4 Comdty
tried sub() in many different ways, like sub({.}, , ED4.Comdty)
etc but could not do it.
Thanks in advance,
Sergey
--
I'm not young enough to know everything. /Oscar Wilde
Experience is one thing you can't get for nothing. /Oscar Wilde
When you are finished changing, you're finished. /Benjamin Franklin
Tell me and I forget, teach me and I remember, involve me and I learn.
/Benjamin Franklin
Luck is where preparation meets opportunity. /George Patten
__
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
[R] Problem installing MASS-Package
Dear R-Help-Team, I tried to use isoMDS-Function of the MASS-Package: Message: Fehler: konnte Funktion isoMDS nicht finden (error: could not find function isoMDS) so I tried to install the package MASS: utils:::menuInstallPkgs() versuche URL 'http://cran.rakanu.com/bin/windows/contrib/2.8/VR_7.2-45.zip' Content type 'application/zip' length 1598763 bytes (1.5 Mb) URL geöffnet downloaded 1.5 Mb Bundel 'VR' erfolgreich ausgepackt und MD5 Summen abgeglichen Warnung: kann alte Installation von Paket 'MASS' nicht entfernen Die heruntergeladenen Pakete sind in C:\Dokumente und Einstellungen\kvanselow\Lokale Einstellungen\Temp\RtmpeIMdIP\downloaded_packages aktualisiere HTML Paketbeschreibungen ok, MASS seems to be already installed. But I cannot run its functions and I cannot find the path: .libPaths(MASS) Fehler in path.expand(new) : objekt MASS nicht gefunden What can I do? Thanks in advance Kim ___ Jetzt 1 Monat kostenlos! WEB.DE FreeDSL - Telefonanschluss + DSL für nur 17,95 EURO/mtl.!* http://dsl.web.de/?ac=OM.AD.AD008K13805B7069a __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Choosing a random number between x and y
On Mon, 2009-02-09 at 06:40 -0800, Vie wrote: Hi, Ive been trying to find a function that will allow me to pull out a number between a minimum and maximum threshold. I want a random decimal number between, for example, 0 and 0.5 or 0 and 0.7. I've been searching everywhere for a function that will allow me to do this in R, but I have yet to be successful. Any help would be much appreciated. Thanks in advance Hi Vie I don't understand if you need a only random generation or mixture random generation, so i will make the 3 examples Using runif 1- Random 10 number Retween 0 and 0.5 runif(10,0,0.5) 2 -Random 20 number Retween 0 and 0.7 runif(20,0,0.7) 3- Random 40 number of mixture two random uniforme random 1 and 2 with p(random1)= 0.3 and p(random=2) = 0.7 ifelse(runif(40).3,runif(40,0,0.7),runif(40,0,0.5)) -- Bernardo Rangel Tura, M.D,MPH,Ph.D National Institute of Cardiology Brazil __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] twitter useRs?
Hi all,
A colleague of mine wrote a little function to send messages to twitter:
update - function(status){
method - http://twitter.com/statuses/update.xml?status=;
encoded_status - URLencode(status)
request - paste(method,encoded_status,sep = )
postForm(request,.opts = opts)
}
See also:
http://twitter.com/sebastiansuncle?page=2, http://pastie.org/367741
Regards
Markus
-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of Tobias Verbeke
Sent: 10 February 2009 08:54
To: Jose Quesada
Cc: r-help@r-project.org
Subject: Re: [R] twitter useRs?
Hi José,
I wonder if there are any useRs sharing day-to-day realizations/tricks
on twitter...
Seems like a good place for those things that are good findings, but
one is too lazy to blog about them...
I don't twitter, but I wrote an R package
to read and write tweets from the R command
line for twitter and laconi.ca.
I will submit it soon, but if anyone is interested
contact me off-list.
Best,
Tobias
__
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and provide commented, minimal, self-contained, reproducible code.
**
The information in this E-Mail and in any attachments is...{{dropped:27}}
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[R] Odp: Problem installing MASS-Package
Hi Did you try to issue library(MASS) before calling isoMDS? Regards Petr r-help-boun...@r-project.org napsal dne 10.02.2009 10:22:57: Dear R-Help-Team, I tried to use isoMDS-Function of the MASS-Package: Message: Fehler: konnte Funktion isoMDS nicht finden (error: could not find function isoMDS) so I tried to install the package MASS: utils:::menuInstallPkgs() versuche URL 'http://cran.rakanu.com/bin/windows/contrib/2.8/VR_7.2-45.zip' Content type 'application/zip' length 1598763 bytes (1.5 Mb) URL geöffnet downloaded 1.5 Mb Bundel 'VR' erfolgreich ausgepackt und MD5 Summen abgeglichen Warnung: kann alte Installation von Paket 'MASS' nicht entfernen Die heruntergeladenen Pakete sind in C:\Dokumente und Einstellungen\kvanselow\Lokale Einstellungen\Temp \RtmpeIMdIP\downloaded_packages aktualisiere HTML Paketbeschreibungen ok, MASS seems to be already installed. But I cannot run its functions and I cannot find the path: .libPaths(MASS) Fehler in path.expand(new) : objekt MASS nicht gefunden What can I do? Thanks in advance Kim ___ Jetzt 1 Monat kostenlos! WEB.DE FreeDSL - Telefonanschluss + DSL für nur 17,95 EURO/mtl.!* http://dsl.web.de/?ac=OM.AD.AD008K13805B7069a __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Fast fourier transformation
Hi, here is a practical problem we would like to solve. In a pneumatic post the acceleration of the capsule is measured and plotted over time. From the graph achieved we would like to derive some kind of statistic value that describes the stress the capsule, or what is in it, is exhibited to. The amount of stress introduced to the capsule will probably depend on two things, the maximum amplitudes observed AND the frequency of these amplitudes. A quick note at this point: Not the acceleration by itself but the quick acceleration changes are the components which make up the special stress we want to quantify. So what I would like to do is: 1) Apply a fourier transformation to the acceleration profile to 2) get a number of harmonic waves describing my graph 3) and use the amplitudes of my waves in a weighted fashion to calculate some statistical value. What I tried to do is: A) construct an artificial profile fg for testing purpose like a. f1 - function(x) 0.5*sin(3*x + pi) b. f2 - function(x) sin(x + 0.75*pi) c. f3 - function(x) 1.5*sin(0.45*x + 0*pi) d. fg - function(x) f1(x) + f2(x) + f3(x) B) try to reconstruct the components of fg with fft or fda. What I don't understand yet is how: X) in my test example I can define the amount of harmonic components, because here I know that number. Of course afterwards in my natural profiles I won't know. Y) I have to transform the values I get out of the fft and fourier functions to estimate the frequency, amplitude and phase of my harmonics. Is there a good function in these packages I can use for that? Best regards, Benjamin -- Pflichtangaben gemäß Gesetz über elektronische Handelsregister und Genossenschaftsregister sowie das Unternehmensregister (EHUG): Universitätsklinikum Hamburg-Eppendorf Körperschaft des öffentlichen Rechts Gerichtsstand: Hamburg Vorstandsmitglieder: Prof. Dr. Jörg F. Debatin (Vorsitzender) Dr. Alexander Kirstein Ricarda Klein Prof. Dr. Dr. Uwe Koch-Gromus [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Problem with retrieving updated variables after attach()
Hello, suppose I have a data frame: mat id age 1 NA NA 2 NA NA 3 NA NA 4 NA NA 5 NA NA Then I attach the data frame: attach(mat) I assign some new values... id - sample(100,5) age - rnorm(5,mean=30) Then I want to create a new data frame from the variables id and age which still are attached to position 2 of the R environment... new_mat - data.frame(ls(pos=2)) # I want to rescue ALL variables that were created by attach(mat) new_mat ls.pos...2. 1 age 2 id But this leads to a bogus object... how can I rescue the updated id and age values into new_mat? Regards, David -- Jetzt 1 Monat kostenlos! GMX FreeDSL - Telefonanschluss + DSL für nur 17,95 Euro/mtl.!* http://dsl.gmx.de/?ac=OM.AD.PD003K11308T4569a __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] need help with installRExcel()
Struggled a whole day, but still could not get DCOM working on my machine. What I did is: 1. Installed R 2.8.1 under folder ../R/R-2.8.1 2. Installed R_Scilab_DCOM3.0-1B5 under folder .. \R\(D)COM Server 3. Installed packages: rscproxy_1.0-12, RExcelInstaller_3.0-10, rcom_2.0-4... 4. run the following commands: library(rscproxy) library(rcom) comRegisterRegistry() library(RExcelInstaller) installRExcel() Problems: 1) Got error message when I run installRExcel(), which was The download site http://rcom.univie.ac.at seems to be currently unreachable. However, I can visit that website from IE-explorer directly. 2) If I run the basic test from (D)Com Sever, I got Runtime Error which read Program: ..\R\(D)COM~1\bin\STATCO~1.EXE abornal program termination, and Run-time error 462, the remote server machine does not exist or is unavailable. Also, the DebugView generated the following report: 0. [2416] ::Init() 00010.00032801 [2416] connector: R 00020.00036630 [2416] DLL:rscproxy.dll 00030.00040314 [2416] environment:R_HOME 00040.00043921 [2416] registry key: Software\R-core\R 00050.00047554 [2416] registry value: InstallPath 00060.00051146 [2416] version key: 00070.00054723 [2416] version value: 00080.00058359 [2416] binary dir: bin 00090.00062370 [2416] connector: Rold 00100.00066010 [2416] DLL:rproxy.dll 00110.00069640 [2416] environment:R_HOME 00120.00073309 [2416] registry key: Software\R-core\R 00130.00076879 [2416] registry value: InstallPath 00140.00080503 [2416] version key: 00150.00084128 [2416] version value: 00160.00087704 [2416] binary dir: bin 00170.00091685 [2416] connector: SciLab 00180.00095268 [2416] DLL:sciproxy.dll 00190.00098887 [2416] environment:SCILAB_HOME 00200.00102560 [2416] registry key: Software\Scilab\%s 00210.00106183 [2416] registry value: SCIPATH 00220.00109763 [2416] version key:Software\Scilab 00230.00113390 [2416] version value: LASTINSTALL 00240.00116993 [2416] binary dir: bin 00250.00124627 [2416] sc_proxy_find_connector: 00860FD0/R (current R) 00260.00128378 [2416] sc_proxy_find_connector: found R 00270.00133204 [2416] looking up registry key at HKCU\Software\R-core\R\InstallPath 00280.00139897 [2416] looking up registry key at HKLM\Software\R-core\R\InstallPath 00290.00154388 [2416] SetEnvironmentVariable(R_HOME,C:\Documents and Settings\xushita\R\R-2.8.1) 00300.00161946 [2416] SetEnvironmentVariable(PATH,C:\progra~1\oracle\product\10.2.0\bin;C:\Program Files\blp\API\dde\;C:\Program Files\blp\API\;C:\Program Files\TimeScape\Program;C:\Program Files\Reuters\Common\Login;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\sybase\OLEDB\;C:\Program Files\sybase\odbc;C:\Program Files\sybase\ocs-12_5\dll;C:\Program Files\sybase\OCS-12_5\lib3p;C:\Program Files\sybase\ocs-12_5\bin;C:\Program Files\oracle\product\9.2.0.1\bin;C:\Program Files\oracle\product\9.2.0.1\jre\1.1.8\bin;C:\Program Files\oracle\product\9.2.0.1\jre\1.1.8\bin;C:\Program Files\GED_Technology\Excel\RiskServer;C:\Program Files\sybase\ado.net\dll;C:\Program Files\sybase\oledb;C:\Program Files\sybase\odbc;C:\Program Files\sybase\ocs-12_5\dll;C:\Program Files\sybase\ocs-12_5\bin;C:\Program Files\Xenomorph\Xenomorph System\Utilities\;C:\Program Files\Xenomorph\Xenomorph System\Program\;C:\Program Files\notes;C:\Program Files\oracle\product\9.2.0.1\jre\1.1.8\bin;c:\Documents and Settings\All Users\GED_Technology\Excel\RiskServer;C:\program files\notes\;C:\Program Files\blp\API\dde;C:\Program Files\blp\API;C:\PROGRA~1\Sybase\ADO.NET\dll;C:\PROGRA~1\Sybase\DataAccess\ODBC\dll;C:\PROGRA~1\Sybase\OCS-12_5\bin;C:\PROGRA~1\Sybase\OCS-12_5\lib3p;C:\PROGRA~1\Sybase\OCS-12_5\dll;C:\PROGRA~1\Sybase\DataAccess\OLEDB\dll;C:\PROGRA~1\Sybase\OLEDB;C:\PROGRA~1\Sybase\ODBC;C:\Program Files\MATLAB\R2008a\bin;H:\matlab\bin;H:\matlab\bin\win32;C:\Program Files\MATLAB\R2008a\bin\win32;C:\Program Files\oracle\product\9.2.0.1\jre\1.1.8\bin;C:\Documents and Settings\xushita\R\R-2.8.1\bin) I appreciate any help! --- Please refer to http://www.db.com/en/content/eu_disclosures.htm for additional EU corporate and regulatory disclosures. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list
Re: [R] installing R on Ubuntu
znmeb wrote: On Mon, Feb 9, 2009 at 4:51 AM, Neil Shephard nsheph...@gmail.com wrote: There are pro's and con's to each of the GNU/Linux flavours and its really a matter of deciding which you like/have invested time in learning. Irrespective its still simple to install R from source under GNU/Linux... 1) Download source tar-ball 2) Extract and cd to the directory 3) ./configure --prefix=/where/you/want/R/to/go (optionally setting the install path at this stage) 4) ./make 5) ./make install ...all documented in the FAQ at http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-R-be-installed-_0028Unix_0029 Many Linux distros do *not* install the development tools by default, and which ones live in which packages varies by distro. Fedora in particular is extremely stripped when you install from the LiveCD. You have to install gcc, make and a couple of other things just to install VMware Tools, for example, when running Fedora as a VMware guest. For building R from source and installing R packages, you'll also need to install gfortran. And many libraries with external dependencies, like Rgraphviz, will require not only the package itself (graphviz) but also the C headers, which may have the name graphviz-devel on some distros and some other name on other distros. What, a Linux distro that *doesn't* come with gcc!! I have to say I'm quite amazed at that!! gfortran is usually a component of gcc, no? I agree that ensuring libraries are available for all of the packages can be tricky, but its not insurmountable (although its one of the reasons I left Slackware in favour of Gentoo), but its no different to learning the vagaries of M$-windows. Its a common misconception I see frequently that computers/software should just work, and thats really not the case. They do what they are told to, and the person using them often needs to understand them in a bit of detail, and this detail is often occluded under Windows so when people try to make the transition from to GNU/Linux they are initially over-whelmed. Anyway, all OT. Neil -- View this message in context: http://www.nabble.com/installing-R-on-Ubuntu-tp10025949p21931845.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Odp: Problem with retrieving updated variables after attach()
Hi r-help-boun...@r-project.org napsal dne 10.02.2009 12:02:53: Hello, suppose I have a data frame: mat id age 1 NA NA 2 NA NA 3 NA NA 4 NA NA 5 NA NA Then I attach the data frame: attach(mat) Look into docs what attach does. If you do not understand environments use attach with great care The database is not actually attached. Rather, a new environment is created on the search path and the elements of a list (including columns of a data frame) or objects in a save file or an environment are copied into the new environment. If you use - or assign to assign to an attached database, you only alter the attached copy, not the original object. (Normal assignment will place a modified version in the user's workspace: see the examples.) For this reason attach can lead to confusion. I assign some new values... id - sample(100,5) age - rnorm(5,mean=30) Then I want to create a new data frame from the variables id and age which still are attached to position 2 of the R environment... new_mat - data.frame(ls(pos=2)) # I want to rescue ALL variables that were created by attach(mat) new_mat ls.pos...2. 1 age 2 id But this leads to a bogus object... how can I rescue the updated id and age values into new_mat? What about not using attach and transform mat directly mat$age - rnorm(5,mean=30) mat$id - sample(100,5) mat id age 1 24 29.17842 2 88 31.22606 3 32 30.81540 4 5 29.31528 5 11 29.32775 Regards Petr Regards, David -- Jetzt 1 Monat kostenlos! GMX FreeDSL - Telefonanschluss + DSL für nur 17,95 Euro/mtl.!* http://dsl.gmx.de/?ac=OM.AD.PD003K11308T4569a __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Replacing dot with empty space
Also, try these alternatives:
sub(., , x, fixed = TRUE)
chartr(., , x)
On Tue, Feb 10, 2009 at 4:02 AM, Sergey Goriatchev serg...@gmail.com wrote:
OK, got it now:
sub([.], , ED4.Comdty)
On Tue, Feb 10, 2009 at 10:01, Sergey Goriatchev serg...@gmail.com wrote:
Hello, everyone
How do I replace dot with empty space in ED4.Comdty?
I need to get ED4 Comdty
tried sub() in many different ways, like sub({.}, , ED4.Comdty)
etc but could not do it.
Thanks in advance,
Sergey
--
I'm not young enough to know everything. /Oscar Wilde
Experience is one thing you can't get for nothing. /Oscar Wilde
When you are finished changing, you're finished. /Benjamin Franklin
Tell me and I forget, teach me and I remember, involve me and I learn.
/Benjamin Franklin
Luck is where preparation meets opportunity. /George Patten
__
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
__
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] Calculating variables
Jesús Guillermo Andrade wrote: Dear fellows: This is the problem: I have 5 variables A, B, C, D and E with a range from 1 to 100 with 0.1 steps. Depending on the different values these have, the results of the formula change: alitemp - ((Abase/llmcc$Clase)*PClase)+(((1/llmcc $Categoria)*Abase)*PCategoria)+((Abase*llmcc$Phi)*PPhi)+((Abase*llmcc $Rf)*PRf) There is no instance of A...E in that formula, is it? So, alitemp (a 283 element series) changes if any of the P** values changes. I need to find a combinations of those 5 variables that approximates the desired results. Although I can make use of a 'for' loop, Im not sure of how to combine the whole 5 variables changing at once. I understand there are many possible combinations (factorial of 5000!, 422 with some 500 digits) but I surmise there must be a better way to do it. So far, I have been changing them manually, but this task make the whole thing terribly slow and inneficient. Any ideas are appreciated. Thanks. What do you really want to know? Some prediction for anything? Or just the time t when 5 variables are changing between t-1 and t? If the latter, calculate first order differences and check for t where all 5 first order differences are not equal to zero. Uwe Ligges Cuanto mas grande son, mas daño hacen. Postulado de Perkin. -- Jesús Guillermo Andrade (Abg.) Gerente de Litigios y Corporativo. EDM. AC. API. Andrade Moreno S.C. (http://amlegal.wordpress.com/) [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] error using R Commander for text file import
Krehbiel, Dwight wrote: I am getting the following error on iMac running Mac OS 10.5.6; this occurs whenever I try to import a text file into R Commander: Error in splitCmd(command) : unbalanced quotes So can you tell us exactly what you did and what the resulting code in the code windows was and how the data file looks like? Does it contain unbalanced quotes, for example? Uwe Ligges Thus, I am unable to import data into R Commander. Any suggestions as to how I might fix this error? I have gotten it many times with more than one installation of R 2.8.1 on this computer. Dwight Krehbiel Bethel College North Newton, KS 67117 USA __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] need help with installRExcel()
Hi , What I did was similar, install R, R(D)COM server an RExcelInstaller package. Then just write installRExcel() in the console. And it works. Something you should know is that there is a specific mailing list for RCOM topic in here: http://mailman.csd.univie.ac.at/mailman/listinfo/rcom-l Regards patricia. To: r-help@r-project.org From: shitao...@db.com Date: Tue, 10 Feb 2009 11:03:05 + Subject: [R] need help with installRExcel() Struggled a whole day, but still could not get DCOM working on my machine. What I did is: 1. Installed R 2.8.1 under folder ../R/R-2.8.1 2. Installed R_Scilab_DCOM3.0-1B5 under folder .. \R\(D)COM Server 3. Installed packages: rscproxy_1.0-12, RExcelInstaller_3.0-10, rcom_2.0-4... 4. run the following commands: library(rscproxy) library(rcom) comRegisterRegistry() library(RExcelInstaller) installRExcel() Problems: 1) Got error message when I run installRExcel(), which was The download site http://rcom.univie.ac.at seems to be currently unreachable. However, I can visit that website from IE-explorer directly. 2) If I run the basic test from (D)Com Sever, I got Runtime Error which read Program: ..\R\(D)COM~1\bin\STATCO~1.EXE abornal program termination, and Run-time error 462, the remote server machine does not exist or is unavailable. Also, the DebugView generated the following report: 0. [2416] ::Init() 00010.00032801 [2416] connector: R 00020.00036630 [2416] DLL:rscproxy.dll 00030.00040314 [2416] environment:R_HOME 00040.00043921 [2416] registry key: Software\R-core\R 00050.00047554 [2416] registry value: InstallPath 00060.00051146 [2416] version key: 00070.00054723 [2416] version value: 00080.00058359 [2416] binary dir: bin 00090.00062370 [2416] connector: Rold 00100.00066010 [2416] DLL:rproxy.dll 00110.00069640 [2416] environment:R_HOME 00120.00073309 [2416] registry key: Software\R-core\R 00130.00076879 [2416] registry value: InstallPath 00140.00080503 [2416] version key: 00150.00084128 [2416] version value: 00160.00087704 [2416] binary dir: bin 00170.00091685 [2416] connector: SciLab 00180.00095268 [2416] DLL:sciproxy.dll 00190.00098887 [2416] environment:SCILAB_HOME 00200.00102560 [2416] registry key: Software\Scilab\%s 00210.00106183 [2416] registry value: SCIPATH 00220.00109763 [2416] version key:Software\Scilab 00230.00113390 [2416] version value: LASTINSTALL 00240.00116993 [2416] binary dir: bin 00250.00124627 [2416] sc_proxy_find_connector: 00860FD0/R (current R) 00260.00128378 [2416] sc_proxy_find_connector: found R 00270.00133204 [2416] looking up registry key at HKCU\Software\R-core\R\InstallPath 00280.00139897 [2416] looking up registry key at HKLM\Software\R-core\R\InstallPath 00290.00154388 [2416] SetEnvironmentVariable(R_HOME,C:\Documents and Settings\xushita\R\R-2.8.1) 00300.00161946 [2416] SetEnvironmentVariable(PATH,C:\progra~1\oracle\product\10.2.0\bin;C:\Program Files\blp\API\dde\;C:\Program Files\blp\API\;C:\Program Files\TimeScape\Program;C:\Program Files\Reuters\Common\Login;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\sybase\OLEDB\;C:\Program Files\sybase\odbc;C:\Program Files\sybase\ocs-12_5\dll;C:\Program Files\sybase\OCS-12_5\lib3p;C:\Program Files\sybase\ocs-12_5\bin;C:\Program Files\oracle\product\9.2.0.1\bin;C:\Program Files\oracle\product\9.2.0.1\jre\1.1.8\bin;C:\Program Files\oracle\product\9.2.0.1\jre\1.1.8\bin;C:\Program Files\GED_Technology\Excel\RiskServer;C:\Program Files\sybase\ado.net\dll;C:\Program Files\sybase\oledb;C:\Program Files\sybase\odbc;C:\Program Files\sybase\ocs-12_5\dll;C:\Program Files\sybase\ocs-12_5\bin;C:\Program Files\Xenomorph\Xenomorph System\Utilities\;C:\Program Files\Xenomorph\Xenomorph System\Program\;C:\Program Files\notes;C:\Program Files\oracle\product\9.2.0.1\jre\1.1.8\bin;c:\Documents and Settings\All Users\GED_Technology\Excel\RiskServer;C:\program files\notes\;C:\Program Files\blp\API\dde;C:\Program
Re: [R] Problem with retrieving updated variables after attach()
attach provides a copy of rather than aliases to the variables within a
data frame.
d = data.frame(x=0)
attach(d)
x
# 0, from the attached copy of d
x = 1
x
# 1, from the global anvironment
d$x
# 0, from d
x - 2
x
# 1, from the global environment
d$x
# 0, from d
get('x', pos=2)
# 2, from the attached copy of d
rm(x)
x
# 2, from the attached copy of d
vQ
David Croll wrote:
Hello,
suppose I have a data frame:
mat
id age
1 NA NA
2 NA NA
3 NA NA
4 NA NA
5 NA NA
Then I attach the data frame:
attach(mat)
I assign some new values...
id - sample(100,5)
age - rnorm(5,mean=30)
Then I want to create a new data frame from the variables id and age which
still are attached to position 2 of the R environment...
new_mat - data.frame(ls(pos=2)) # I want to rescue ALL variables that were
created by attach(mat)
new_mat
ls.pos...2.
1 age
2 id
But this leads to a bogus object... how can I rescue the updated id and age
values into new_mat?
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
[R] harmonic function fiting? how to do
Dear R Users, I have a CO2 time series. I want to fit this series seasonal cycle and trend with fourth harmonic function, and then compute residuals. I am doing something like: file-read.csv(co2data.csv) names(file) attach(file) fit-lm(co2~1+time+I(time^2)+sin(2*pi*time)+cos(2*pi*time)+sin(4*pi*time)+cos(4*pi*time)+ sin(6*pi*time)+cos(6*pi*time)+sin(8*pi*time)+cos(8*pi*time),data=file) fit$residuals # variable 'co2' is in ppmv and variable 'time' is in the form of decimal time. The problem is: when I plot above residuals vs. time, it still shows some seasonal cycle with time. SO, I doubt that I am doing something wrong. Kindly help, how to fit correctly, a fourth harmonic function on CO2 which is varying with variable 'time'. Great thanks, Regards, Yogesh -- Yogesh K. Tiwari (Dr.rer.nat), Scientist, Indian Institute of Tropical Meteorology, Homi Bhabha Road, Pashan, Pune-411008 INDIA Phone: 0091-99 2273 9513 (Cell) : 0091-20-258 93 600 (O) (Ext.250) Fax: 0091-20-258 93 825 [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Choosing a random number between x and y
Thanks a lot everyone. You've been a great help! -- View this message in context: http://www.nabble.com/Choosing-a-random-number-between-x-and-y-tp21914106p21930844.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Odp: Problem with retrieving updated variables after attach()
Well, I knew that attach() only creates a copy of the variables in the search path. What I wanted to ask was how to *retrieve* that copy... mat id age 1 NA NA 2 NA NA 3 NA NA 4 NA NA 5 NA NA attach(mat) id - sample(100,5) age - rnorm(5,mean=30) How can I make a new data frame out of the id and age that were changed above? Hi r-help-boun...@r-project.org napsal dne 10.02.2009 12:02:53: Hello, suppose I have a data frame: mat id age 1 NA NA 2 NA NA 3 NA NA 4 NA NA 5 NA NA Then I attach the data frame: attach(mat) Look into docs what attach does. If you do not understand environments use attach with great care The database is not actually attached. Rather, a new environment is created on the search path and the elements of a list (including columns of a data frame) or objects in a save file or an environment are copied into the new environment. If you use - or assign to assign to an attached database, you only alter the attached copy, not the original object. (Normal assignment will place a modified version in the user's workspace: see the examples.) For this reason attach can lead to confusion. I assign some new values... id - sample(100,5) age - rnorm(5,mean=30) Then I want to create a new data frame from the variables id and age which still are attached to position 2 of the R environment... new_mat - data.frame(ls(pos=2)) # I want to rescue ALL variables that were created by attach(mat) new_mat ls.pos...2. 1 age 2 id But this leads to a bogus object... how can I rescue the updated id and age values into new_mat? What about not using attach and transform mat directly mat$age - rnorm(5,mean=30) mat$id - sample(100,5) mat id age 1 24 29.17842 2 88 31.22606 3 32 30.81540 4 5 29.31528 5 11 29.32775 Regards Petr Regards, David -- Jetzt 1 Monat kostenlos! GMX FreeDSL - Telefonanschluss + DSL für nur 17,95 Euro/mtl.!* http://dsl.gmx.de/?ac=OM.AD.PD003K11308T4569a __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] need help with installRExcel()
Thank you, Patricia, So basically, both of us did the same thing, but installRExcel() just worked in your case. Because I was installing (D)COM on my company's computer ( I have temporary admin right), do you think it may be due to that Excel won't allow the change caused by calling installRExcel()? patricia garcía gonzález kurtney...@hotmail.com 10/02/2009 11:58 To Shitao Xu/db/db...@dbemea, r-help@r-project.org cc Subject RE: [R] need help with installRExcel() Hi , What I did was similar, install R, R(D)COM server an RExcelInstaller package. Then just write installRExcel() in the console. And it works. Something you should know is that there is a specific mailing list for RCOM topic in here: http://mailman.csd.univie.ac.at/mailman/listinfo/rcom-l Regards patricia. To: r-help@r-project.org From: shitao...@db.com Date: Tue, 10 Feb 2009 11:03:05 + Subject: [R] need help with installRExcel() Struggled a whole day, but still could not get DCOM working on my machine. What I did is: 1. Installed R 2.8.1 under folder ../R/R-2.8.1 2. Installed R_Scilab_DCOM3.0-1B5 under folder .. \R\(D)COM Server 3. Installed packages: rscproxy_1.0-12, RExcelInstaller_3.0-10, rcom_2.0-4... 4. run the following commands: library(rscproxy) library(rcom) comRegisterRegistry() library(RExcelInstaller) installRExcel() Problems: 1) Got error message when I run installRExcel(), which was The download site http://rcom.univie.ac.at seems to be currently unreachable. However, I can visit that website from IE-explorer directly. 2) If I run the basic test from (D)Com Sever, I got Runtime Error which read Program: ..\R\(D)COM~1\bin\STATCO~1.EXE abornal program termination, and Run-time error 462, the remote server machine does not exist or is unavailable. Also, the DebugView generated the following report: 0. [2416] ::Init() 0001 0.00032801 [2416] connector: R 0002 0.00036630 [2416] DLL: rscproxy.dll 0003 0.00040314 [2416] environment: R_HOME 0004 0.00043921 [2416] registry key: Software\R-core\R 0005 0.00047554 [2416] registry value: InstallPath 0006 0.00051146 [2416] version key: 0007 0.00054723 [2416] version value: 0008 0.00058359 [2416] binary dir: bin 0009 0.00062370 [2416] connector: Rold 0010 0.00066010 [2416] DLL: rproxy.dll 0011 0.00069640 [2416] environment: R_HOME 0012 0.00073309 [2416] registry key: Software\R-core\R 0013 0.00076879 [2416] registry value: InstallPath 0014 0.00080503 [2416] version key: 0015 0.00084128 [2416] version value: 0016 0.00087704 [2416] binary dir: bin 0017 0.00091685 [2416] connector: SciLab 0018 0.00095268 [2416] DLL: sciproxy.dll 0019 0.00098887 [2416] environment: SCILAB_HOME 0020 0.00102560 [2416] registry key: Software\Scilab\%s 0021 0.00106183 [2416] registry value: SCIPATH 0022 0.00109763 [2416] version key: Software\Scilab 0023 0.00113390 [2416] version value: LASTINSTALL 0024 0.00116993 [2416] binary dir: bin 0025 0.00124627 [2416] sc_proxy_find_connector: 00860FD0/R (current R) 0026 0.00128378 [2416] sc_proxy_find_connector: found R 0027 0.00133204 [2416] looking up registry key at HKCU\Software\R-core\R\InstallPath 0028 0.00139897 [2416] looking up registry key at HKLM\Software\R-core\R\InstallPath 0029 0.00154388 [2416] SetEnvironmentVariable(R_HOME,C:\Documents and Settings\xushita\R\R-2.8.1) 0030 0.00161946 [2416] SetEnvironmentVariable(PATH,C:\progra~1\oracle\product\10.2.0\bin;C:\Program Files\blp\API\dde\;C:\Program Files\blp\API\;C:\Program Files\TimeScape\Program;C:\Program Files\Reuters\Common\Login;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\sybase\OLEDB\;C:\Program Files\sybase\odbc;C:\Program Files\sybase\ocs-12_5\dll;C:\Program Files\sybase\OCS-12_5\lib3p;C:\Program Files\sybase\ocs-12_5\bin;C:\Program Files\oracle\product\9.2.0.1\bin;C:\Program Files\oracle\product\9.2.0.1\jre\1.1.8\bin;C:\Program Files\oracle\product\9.2.0.1\jre\1.1.8\bin;C:\Program Files\GED_Technology\Excel\RiskServer;C:\Program Files\sybase\ado.net\dll;C:\Program Files\sybase\oledb;C:\Program Files\sybase\odbc;C:\Program Files\sybase\ocs-12_5\dll;C:\Program Files\sybase\ocs-12_5\bin;C:\Program Files\Xenomorph\Xenomorph System\Utilities\;C:\Program Files\Xenomorph\Xenomorph System\Program\;C:\Program Files\notes;C:\Program Files\oracle\product\9.2.0.1\jre\1.1.8\bin;c:\Documents and Settings\All Users\GED_Technology\Excel\RiskServer;C:\program files\notes\;C:\Program Files\blp\API\dde;C:\Program
Re: [R] harmonic function fiting? how to do
dear Yogesh It appears that your model based on parametric terms is too inflexible.. A better alternative to parametric harmonic terms is a spline-based approach, may be cyclic splines.. Have a look to the mgcv package.. vito Yogesh Tiwari ha scritto: Dear R Users, I have a CO2 time series. I want to fit this series seasonal cycle and trend with fourth harmonic function, and then compute residuals. I am doing something like: file-read.csv(co2data.csv) names(file) attach(file) fit-lm(co2~1+time+I(time^2)+sin(2*pi*time)+cos(2*pi*time)+sin(4*pi*time)+cos(4*pi*time)+ sin(6*pi*time)+cos(6*pi*time)+sin(8*pi*time)+cos(8*pi*time),data=file) fit$residuals # variable 'co2' is in ppmv and variable 'time' is in the form of decimal time. The problem is: when I plot above residuals vs. time, it still shows some seasonal cycle with time. SO, I doubt that I am doing something wrong. Kindly help, how to fit correctly, a fourth harmonic function on CO2 which is varying with variable 'time'. Great thanks, Regards, Yogesh -- Vito M.R. Muggeo Dip.to Sc Statist e Matem `Vianelli' Università di Palermo viale delle Scienze, edificio 13 90128 Palermo - ITALY tel: 091 6626240 fax: 091 485726/485612 http://dssm.unipa.it/vmuggeo __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Replacing dot with empty space
Thanks, Gabor.
You are always very helpful.
On Tue, Feb 10, 2009 at 12:42, Gabor Grothendieck
ggrothendi...@gmail.com wrote:
Also, try these alternatives:
sub(., , x, fixed = TRUE)
chartr(., , x)
On Tue, Feb 10, 2009 at 4:02 AM, Sergey Goriatchev serg...@gmail.com wrote:
OK, got it now:
sub([.], , ED4.Comdty)
On Tue, Feb 10, 2009 at 10:01, Sergey Goriatchev serg...@gmail.com wrote:
Hello, everyone
How do I replace dot with empty space in ED4.Comdty?
I need to get ED4 Comdty
tried sub() in many different ways, like sub({.}, , ED4.Comdty)
etc but could not do it.
Thanks in advance,
Sergey
--
I'm not young enough to know everything. /Oscar Wilde
Experience is one thing you can't get for nothing. /Oscar Wilde
When you are finished changing, you're finished. /Benjamin Franklin
Tell me and I forget, teach me and I remember, involve me and I learn.
/Benjamin Franklin
Luck is where preparation meets opportunity. /George Patten
__
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https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
I'm not young enough to know everything. /Oscar Wilde
Experience is one thing you can't get for nothing. /Oscar Wilde
When you are finished changing, you're finished. /Benjamin Franklin
Tell me and I forget, teach me and I remember, involve me and I learn.
/Benjamin Franklin
Luck is where preparation meets opportunity. /George Patten
__
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] Odp: Problem with retrieving updated variables after attach()
David Croll wrote: Well, I knew that attach() only creates a copy of the variables in the search path. What I wanted to ask was how to *retrieve* that copy... mat id age 1 NA NA 2 NA NA 3 NA NA 4 NA NA 5 NA NA attach(mat) id - sample(100,5) age - rnorm(5,mean=30) How can I make a new data frame out of the id and age that were changed above? data.frame(id, age) # from the copy data.frame(mat$id, mat$age) # from the originals why do you need to overwrite the copy? vQ __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] general inverse solver?
Yacas was completely rewritten in java (Ryacas interfaces to the C version) since the Ryacas project started so I would not exactly characterize yacas as dead. The work that is going on in yacas may not have high visibility but that does not mean there is none. Also while Maxima is more sophisticated in terms of algorithms, yacas is actually more sophisticated from the viewpoint of its language which borrows ideas from both imperative and prolog programming and its interfaces are more sophisticated (it is one of the few CAS systems that developed an OpenMath interface) and its socket server is used by the Ryacas interface. yacas can also translate math expressions to TeX and do exact arithmetic. Also to put this in the correct context, yacas does seem capable of answering the majority of questions that are posed on r-help that need a CAS in the answer. From a practical viewpoint it does seem to have the facilities that are most often needed. The Ryacas vignette has a survey of some of its algebra capabilities. That being said, without taking away from yacas there is work going on to interface R to a second CAS. On Tue, Feb 10, 2009 at 2:33 AM, Hans W. Borchers hwborch...@googlemail.com wrote: I know that Ryacas is promoted here whenever requests about symbolic algebra or calculus appear on the R-help list. But to say the truth, Yacas itself is a very very limited Computer Algebra System and looking onto its home page it appears the development will stop or has stopped anyway. It would be fair to clearly state that there is no R package to solve somewhat more involved symbolic mathematical problems. One could then point the requestor to one of the open source Computer Algebra Systems (CAS) such as Maxima or Axiom. Interestingly, the free Math Toolbox Euler by Grossmann has integrated Maxima into its numerical environment in a way that is really useful for numerical and symbolic computations. I could imagine that in a similar way Maxima can be integrated into R bringing the full power of computer algebra to the R community. Hans W. Borchers ABB Corporate Research Postscript The Euler Mathematical Toolbox is a powerful, versatile, and open source software for numerical and symbolic computations ... Euler supports symbolic mathematics using the open algebra system Maxima. http://mathsrv.ku-eichstaett.de/MGF/homes/grothmann/euler/ Gabor Grothendieck wrote: The forms of equations are limited but its not limited to just one: library(Ryacas) Loading required package: XML x - Sym(x) y - Sym(y) Solve(List(x+y == 2, x-y == 0), List(x, y)) [1] Starting Yacas! expression(list(list(x == 2 - y, y == 1))) On Mon, Feb 9, 2009 at 7:45 PM, Carl Witthoft c...@witthoft.com wrote: Gabor G a ecrit: Check out the Ryacas package. There is a vignette with some examples. Which led me to the manuals for yacas itself. I'm guessing there may be a way to use yacas' AND construct to combine a few equations and then hope the Newton Solver can work with that, but it's not clear that will work. TK!Solver is nice because you aren't limited to linear equations, nor to equations which fit into a matrix structure, and because it's legal to have more than one unknown to be back-solved (assuming the problem is not under- or over-defined, of course). __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- View this message in context: http://www.nabble.com/general-inverse-solver--tp21902788p21928972.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Odp: Problem with retrieving updated variables after attach()
G'day David, On Tue, 10 Feb 2009 13:23:50 +0100 David Croll david.cr...@gmx.ch wrote: Well, I knew that attach() only creates a copy of the variables in the search path. What I wanted to ask was how to *retrieve* that copy... mat id age 1 NA NA 2 NA NA 3 NA NA 4 NA NA 5 NA NA attach(mat) id - sample(100,5) age - rnorm(5,mean=30) How can I make a new data frame out of the id and age that were changed above? R new.df - data.frame(id,age) Or, perhaps more automatic: R new.df - do.call(data.frame, sapply(ls(pos=2), as.name)) Is this what you are after? Cheers, Berwin === Full address = Berwin A TurlachTel.: +65 6516 4416 (secr) Dept of Statistics and Applied Probability+65 6516 6650 (self) Faculty of Science FAX : +65 6872 3919 National University of Singapore 6 Science Drive 2, Blk S16, Level 7 e-mail: sta...@nus.edu.sg Singapore 117546http://www.stat.nus.edu.sg/~statba __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] A recommender system package?
Hi all, Recommendation technique is popular in recent web application. I was wondering is there any R package used for recommender system? Thanks in advance. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Odp: Problem with retrieving updated variables after attach()
Berwin A Turlach wrote:
G'day David,
On Tue, 10 Feb 2009 13:23:50 +0100
David Croll david.cr...@gmx.ch wrote:
Well, I knew that attach() only creates a copy of the variables in
the search path.
What I wanted to ask was how to *retrieve* that copy...
mat
id age
1 NA NA
2 NA NA
3 NA NA
4 NA NA
5 NA NA
attach(mat)
id - sample(100,5)
age - rnorm(5,mean=30)
How can I make a new data frame out of the id and age that were
changed above?
R new.df - data.frame(id,age)
Or, perhaps more automatic:
R new.df - do.call(data.frame, sapply(ls(pos=2), as.name))
Is this what you are after?
There is also
as.data.frame(as.list(pos.to.env(2)))
or ...as.environment(mat)
I wouldn't recommend using - like that though; the consequences of
spelling mistakes on the LHS are a bit scary. If you must, consider
with(pos.to.env(2),{
id - sample(100,5)
age - rnorm(5,mean=30)
})
or better, modify before attach, using within() or transform().
--
O__ Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~ - (p.dalga...@biostat.ku.dk) FAX: (+45) 35327907
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and provide commented, minimal, self-contained, reproducible code.
Re: [R] Odp: Problem with retrieving updated variables after attach()
Berwin A Turlach wrote: G'day David, On Tue, 10 Feb 2009 13:23:50 +0100 David Croll david.cr...@gmx.ch wrote: Well, I knew that attach() only creates a copy of the variables in the search path. What I wanted to ask was how to *retrieve* that copy... mat id age 1 NA NA 2 NA NA 3 NA NA 4 NA NA 5 NA NA attach(mat) id - sample(100,5) age - rnorm(5,mean=30) How can I make a new data frame out of the id and age that were changed above? R new.df - data.frame(id,age) Or, perhaps more automatic: R new.df - do.call(data.frame, sapply(ls(pos=2), as.name)) or perhaps: new.df - as.data.frame(mget(names(mat), as.environment(2))) vQ __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Odp: Problem with retrieving updated variables after attach()
Hi r-help-boun...@r-project.org napsal dne 10.02.2009 13:57:44: G'day David, On Tue, 10 Feb 2009 13:23:50 +0100 David Croll david.cr...@gmx.ch wrote: Well, I knew that attach() only creates a copy of the variables in the search path. What I wanted to ask was how to *retrieve* that copy... mat id age 1 NA NA 2 NA NA 3 NA NA 4 NA NA 5 NA NA attach(mat) id - sample(100,5) age - rnorm(5,mean=30) How can I make a new data frame out of the id and age that were changed above? R new.df - data.frame(id,age) Or, perhaps more automatic: R new.df - do.call(data.frame, sapply(ls(pos=2), as.name)) Is this what you are after? The question is why he wants to do this? I do not see the point of attaching data frame, changing something in attached frame and then keeping a new copy. Why not mat new.mat - mat new.mat[,n1] - some change new.mat[,n2] - some other change without tricky use of attach if he wants to keep the changed copy. Regards Petr Cheers, Berwin === Full address = Berwin A TurlachTel.: +65 6516 4416 (secr) Dept of Statistics and Applied Probability+65 6516 6650 (self) Faculty of Science FAX : +65 6872 3919 National University of Singapore 6 Science Drive 2, Blk S16, Level 7 e-mail: sta...@nus.edu.sg Singapore 117546http://www.stat.nus.edu.sg/~statba __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] error using R Commander for text file import
Dear Uwe, Thanks for trying to field this question, but the error is unlikely to be related to the data since splitCmd() is used internally to format commands generated by the Rcmdr so that they fit in the Script window. Unfortunately, the contents of the Script window are likely to be uninformative since the offending line won't have been displayed. Dwight: I've never seen this error, nor has anyone else reported it, and as you might imagine, importing a text file is a very common operation. Although I can't rule it out at this point, I suspect that if this were a bug in the Rcmdr, it would have surfaced before. Some more information about what you did might help. Commands generated by the Rcmdr shouldn't have unbalanced quotes unless the user enters them, e.g., in a text field. For example, might you have tried to place quotes around the name of the data set. Regards, John -- John Fox, Professor Department of Sociology McMaster University Hamilton, Ontario, Canada web: socserv.mcmaster.ca/jfox -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Uwe Ligges Sent: February-10-09 6:52 AM To: Krehbiel, Dwight Cc: r-help@r-project.org Subject: Re: [R] error using R Commander for text file import Krehbiel, Dwight wrote: I am getting the following error on iMac running Mac OS 10.5.6; this occurs whenever I try to import a text file into R Commander: Error in splitCmd(command) : unbalanced quotes So can you tell us exactly what you did and what the resulting code in the code windows was and how the data file looks like? Does it contain unbalanced quotes, for example? Uwe Ligges Thus, I am unable to import data into R Commander. Any suggestions as to how I might fix this error? I have gotten it many times with more than one installation of R 2.8.1 on this computer. Dwight Krehbiel Bethel College North Newton, KS 67117 USA __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting- guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Fast fourier transformation
botto b.otto at uke.uni-hamburg.de writes: here is a practical problem we would like to solve. In a pneumatic post the acceleration of the capsule is measured and plotted over time. From the graph achieved we would like to derive some kind of statistic value that describes the stress the capsule, or what is in it, is exhibited to. .. 1) Apply a fourier transformation to the acceleration profile to 2) get a number of harmonic waves describing my graph 3) and use the amplitudes of my waves in a weighted fashion to calculate some statistical value. What I tried to do is: A) construct an artificial profile fg for testing purpose like a. f1 - function(x) 0.5*sin(3*x + pi) X) in my test example I can define the amount of harmonic components, because here I know that number. Of course afterwards in my natural profiles I won't know. Y) I have to transform the values I get out of the fft and fourier functions to estimate the frequency, amplitude and phase of my harmonics. Check function spectrum in stats which also has some methods to provide smoothed plots. There is also package signal which I have not tried. And don't expect too much of phase plots, I have seen generations of students jumping on these to explain the universum, the EEG and US politics because it sound so mysterious, and never seen a working method coming out of it. It would have been good if you had provided a real example series because then it would have been possible to tell you if you could find a reasonable estimate of the true frequency and acceleration. In general, when you have only very few oscillations, you get a seemingly lousy estimate, which is only the consequence of how fft is defined as a rather broad-minded model. If you are sure that there is a single frequency with harmonics, other methods such as cyclic gams or even cyclic nlme (see the oestrus example in that package) might provide better results. Dieter __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Fast fourier transformation
A powerful scheme for harmonic inversion of time signals known as filter diagonalization method is available from MIT: http://ab-initio.mit.edu/wiki/index.php/Harminv I don't know of any R interface, but it might be a good option for your problem. Cheers, baptiste On 10 Feb 2009, at 13:40, Dieter Menne wrote: botto b.otto at uke.uni-hamburg.de writes: here is a practical problem we would like to solve. In a pneumatic post the acceleration of the capsule is measured and plotted over time. From the graph achieved we would like to derive some kind of statistic value that describes the stress the capsule, or what is in it, is exhibited to. .. 1) Apply a fourier transformation to the acceleration profile to 2) get a number of harmonic waves describing my graph 3) and use the amplitudes of my waves in a weighted fashion to calculate some statistical value. What I tried to do is: A) construct an artificial profile fg for testing purpose like a. f1 - function(x) 0.5*sin(3*x + pi) X) in my test example I can define the amount of harmonic components, because here I know that number. Of course afterwards in my natural profiles I won't know. Y) I have to transform the values I get out of the fft and fourier functions to estimate the frequency, amplitude and phase of my harmonics. Check function spectrum in stats which also has some methods to provide smoothed plots. There is also package signal which I have not tried. And don't expect too much of phase plots, I have seen generations of students jumping on these to explain the universum, the EEG and US politics because it sound so mysterious, and never seen a working method coming out of it. It would have been good if you had provided a real example series because then it would have been possible to tell you if you could find a reasonable estimate of the true frequency and acceleration. In general, when you have only very few oscillations, you get a seemingly lousy estimate, which is only the consequence of how fft is defined as a rather broad-minded model. If you are sure that there is a single frequency with harmonics, other methods such as cyclic gams or even cyclic nlme (see the oestrus example in that package) might provide better results. Dieter __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. _ Baptiste Auguié School of Physics University of Exeter Stocker Road, Exeter, Devon, EX4 4QL, UK Phone: +44 1392 264187 http://newton.ex.ac.uk/research/emag __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] how to use axes=FALSE to get multple plots?
I am trying to plot two things on one graph, with a y-axis at the left for one variable, and a y-axis at the right, for the other variable. I thought I could do as follows par(mar=rep(4.5, 4)) plot(0:10, 10:20) par(new=TRUE) plot(0:10, 100:110, axes=FALSE) axis(4) but this writes both y-axis labels on the left-hand side, and nothing on the right-hand side. This is R 2.8.1 (2008-12-22) on OS-X. Am I missing something? PS. I know that I can just make ylab= and draw the right-hand axis name with mtext, but that then I would need to check par(mgp), to find where place it, etc. I'm thinking that I am just missing something in my understanding. -- View this message in context: http://www.nabble.com/how-to-use-axes%3DFALSE-to-get-multple-plots--tp21934005p21934005.html Sent from the R help mailing list archive at Nabble.com. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] What is the R equivalent of STATA's 'drop' command?
Try something like rm(list=ls(pattern=y+)) John 2009/2/10 stephen sefick ssef...@gmail.com: It depends on how the data is set up (I am not an expert), but I have had good results with the subset function. subset(x, var!=3 var!=4) this will take the subset of the dataframe x where var is not equal to 3 or 4. a - rnorm(25) var - rep(c(1:5), 5) x - data.frame(a, var) subset(x, var!=3 var!=4) Is this what you want? Stephen Sefick On Mon, Feb 9, 2009 at 7:27 PM, jjh21 jjhar...@gmail.com wrote: Hello, I am trying to do some data cleaning in R. I need to drop observations that take on certain values of a variable. In STATA I might type something like: drop if variable name == 3 drop if variable name == 4 Is there an R equivalent of this? I have tried playing around with the subset command, but it seems a bit clunky. What would an advanced R user's approach be for something like this? Thank you! -- View this message in context: http://www.nabble.com/What-is-the-R-equivalent-of-STATA%27s-%27drop%27-command--tp21925249p21925249.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Stephen Sefick Let's not spend our time and resources thinking about things that are so little or so large that all they really do for us is puff us up and make us feel like gods. We are mammals, and have not exhausted the annoying little problems of being mammals. -K. Mullis __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- John C Frain Trinity College Dublin Dublin 2 Ireland www.tcd.ie/Economics/staff/frainj/home.html mailto:fra...@tcd.ie mailto:fra...@gmail.com __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] general inverse solver?
My main problem is that yacas can only factorize polynomials in one variable. Any CAS which is not able to factor a^2 - b^2 into (a+b)*(a-B) for me is less than satisfactory. On Feb 10, 2009, at 1:51 PM, Gabor Grothendieck wrote: Yacas was completely rewritten in java (Ryacas interfaces to the C version) since the Ryacas project started so I would not exactly characterize yacas as dead. The work that is going on in yacas may not have high visibility but that does not mean there is none. Also while Maxima is more sophisticated in terms of algorithms, yacas is actually more sophisticated from the viewpoint of its language which borrows ideas from both imperative and prolog programming and its interfaces are more sophisticated (it is one of the few CAS systems that developed an OpenMath interface) and its socket server is used by the Ryacas interface. yacas can also translate math expressions to TeX and do exact arithmetic. Also to put this in the correct context, yacas does seem capable of answering the majority of questions that are posed on r-help that need a CAS in the answer. From a practical viewpoint it does seem to have the facilities that are most often needed. The Ryacas vignette has a survey of some of its algebra capabilities. That being said, without taking away from yacas there is work going on to interface R to a second CAS. On Tue, Feb 10, 2009 at 2:33 AM, Hans W. Borchers hwborch...@googlemail.com wrote: I know that Ryacas is promoted here whenever requests about symbolic algebra or calculus appear on the R-help list. But to say the truth, Yacas itself is a very very limited Computer Algebra System and looking onto its home page it appears the development will stop or has stopped anyway. It would be fair to clearly state that there is no R package to solve somewhat more involved symbolic mathematical problems. One could then point the requestor to one of the open source Computer Algebra Systems (CAS) such as Maxima or Axiom. Interestingly, the free Math Toolbox Euler by Grossmann has integrated Maxima into its numerical environment in a way that is really useful for numerical and symbolic computations. I could imagine that in a similar way Maxima can be integrated into R bringing the full power of computer algebra to the R community. Hans W. Borchers ABB Corporate Research Postscript The Euler Mathematical Toolbox is a powerful, versatile, and open source software for numerical and symbolic computations ... Euler supports symbolic mathematics using the open algebra system Maxima. http://mathsrv.ku-eichstaett.de/MGF/homes/grothmann/euler/ Gabor Grothendieck wrote: The forms of equations are limited but its not limited to just one: library(Ryacas) Loading required package: XML x - Sym(x) y - Sym(y) Solve(List(x+y == 2, x-y == 0), List(x, y)) [1] Starting Yacas! expression(list(list(x == 2 - y, y == 1))) On Mon, Feb 9, 2009 at 7:45 PM, Carl Witthoft c...@witthoft.com wrote: Gabor G a ecrit: Check out the Ryacas package. There is a vignette with some examples. Which led me to the manuals for yacas itself. I'm guessing there may be a way to use yacas' AND construct to combine a few equations and then hope the Newton Solver can work with that, but it's not clear that will work. TK!Solver is nice because you aren't limited to linear equations, nor to equations which fit into a matrix structure, and because it's legal to have more than one unknown to be back-solved (assuming the problem is not under- or over-defined, of course). __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- View this message in context: http://www.nabble.com/general-inverse-solver--tp21902788p21928972.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Erich Neuwirth, University of Vienna Faculty of Computer Science Computer Supported Didactics Working Group Visit our SunSITE at http://sunsite.univie.ac.at Phone: +43-1-4277-39464 Fax: +43-1-4277-39459 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide
[R] Help regarding White's Heteroscedasticity Correction
Hi I am actually running the White test for correcting Heteroscedasticity. I used sandwich() car(), however the output shows the updated t test of coefficients, with revised Standard Errors, however the estimates remained same. My problem is that the residuals formed a pattern in the original regression equation. After running the White's test, I got some new standard errors - but from here I didn't understand how to plot the residuals (or) how to correct the estimates?? Can some one direct me in this regard.. Best, Kishore/.. http://kaykayatisb.blogspot.com [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] how to use axes=FALSE to get multple plots?
Dan Kelley wrote: I am trying to plot two things on one graph, with a y-axis at the left for one variable, and a y-axis at the right, for the other variable. I thought I could do as follows par(mar=rep(4.5, 4)) plot(0:10, 10:20) par(new=TRUE) plot(0:10, 100:110, axes=FALSE) axis(4) but this writes both y-axis labels on the left-hand side, and nothing on the right-hand side. This is R 2.8.1 (2008-12-22) on OS-X. Am I missing something? PS. I know that I can just make ylab= and draw the right-hand axis name with mtext, but that then I would need to check par(mgp), to find where place it, etc. I'm thinking that I am just missing something in my understanding. axis() doesn't draw axis labels. There isn't a simple function for drawing text on side 4 as far as I know, but mtext is not so bad: use mtext(Right label, side=4, line=3) to emulate the default ylab, but put it on the right. See ?title for more details if you've changed the default locations. I don't like to use plot(new=TRUE), because there are lots of things that can go wrong when you overplot high level graphics (I'd use points() instead), but your example is one of the few cases where you can make just as many errors using points() as using par(new=TRUE). Are you really sure you want a graph with two different scales on it? Duncan Murdoch __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] lattice shingle with time and date format
Hi R-Users, I have a time series of bivariate observations (x,y,t). I've developed a few panel routines to explore certain aspects of the data, and now would like to break the time series up into smaller chunks to explore the temporal trends. I would like to know if anyone has any experience breaking up time series with lattice. Base graphics offers coplot, utilizing the co.intervals routine to break up the series into equal chunks. Lattice has equal.count as a wrapper for co.intervals. As you can see in the example below, I can recreate a 'coplot' with lattice but am having difficulty getting the x-axis of the shingle plot and the strip labeling on the xyplot to be in time or date format. My question really consists of two parts, with the second part being less important for my data visualization purposes: 1) How might I be able to convert the x-axis of the shingle plot from numeric to date format? 2) How might I be able to customize the strip labels on the xyplot to show a range, like min(month, year)-max(month, year) for each panel? Thank you very much for any helpful suggestions. Jon # # Example R script library(lattice) times-as.Date(seq(11400,14190, length.out=100),origin=1970-01-01) x-rnorm(100) y-rnorm(100) df-data.frame(x=x,y=y,times=times) #I want to recreate something like coplot with lattice coplot(y~x|times,data=df) #this doesn't work, which is an issue with co.intervals breaks-equal.count(times) #this does work breaks-equal.count(unclass(times)) #In the lattice book there is this outline bPlot-plot(breaks) dPlot-xyplot(y~x|breaks, data=df) plot(bPlot, position=c(0,0.65,1,1)) plot(dPlot, position=c(0,0,1,0.65),newpage=FALSE) #The plot is ok, but the xaxis is in numeric and not date # Jon Loehrke Graduate Research Assistant Department of Fisheries Oceanography School for Marine Science and Technology University of Massachusetts 200 Mill Road, Suite 325 Fairhaven, MA 02719 jloeh...@umassd.edu sessionInfo() R version 2.8.1 (2008-12-22) i386-apple-darwin8.11.1 locale: en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8 attached base packages: [1] grid stats graphics grDevices utils datasets methods base other attached packages: [1] lattice_0.17-17 [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Odp: Problem with retrieving updated variables after attach()
Thank you, this does the job perfectly! Regards, David R new.df - data.frame(id,age) Or, perhaps more automatic: R new.df - do.call(data.frame, sapply(ls(pos=2), as.name)) Is this what you are after? Cheers, Berwin __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Help regarding White's Heteroscedasticity Correction
Generally in the presence of heteroskedasticity of unknown form OLS produces consistent estimates of your regression coefficients. The estimates of standard errors are biased in the presence of heteroskedasticity, White's procedure is a way of producing consistent estimates of the standard errors. It does not change the estimates of the coefficients. It does not change the residuals. Patterns in your residuals may show up as heteroskedasticity when tested but they may be an indication of wrong functional form or of missing variables or of some other form of misspecification. Best Regards John 2009/2/10 Kishore gladikish...@gmail.com: Hi I am actually running the White test for correcting Heteroscedasticity. I used sandwich() car(), however the output shows the updated t test of coefficients, with revised Standard Errors, however the estimates remained same. My problem is that the residuals formed a pattern in the original regression equation. After running the White's test, I got some new standard errors - but from here I didn't understand how to plot the residuals (or) how to correct the estimates?? Can some one direct me in this regard.. Best, Kishore/.. http://kaykayatisb.blogspot.com [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- John C Frain Trinity College Dublin Dublin 2 Ireland www.tcd.ie/Economics/staff/frainj/home.html mailto:fra...@tcd.ie mailto:fra...@gmail.com __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] ISOdatetime gives NA for a specific date
Hi all, I am using ISOdatetime, and I just found out that when I do ISOdatetime(1995,03,26,2,10,0) (or any other value under minutes or seconds) I get NA This does not happen with the same time in other dates, nor with different hours in the same date. Any hint why this happens? Using R 2.8.1 under ESS/GnuEmacs under Windows XP Pedro -- View this message in context: http://www.nabble.com/ISOdatetime-gives-NA-for-a-specific-date-tp21934989p21934989.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Help regarding White's Heteroscedasticity Correction
Dear Kishore, Yes, White's heteroscedasticity-consistent standard errors are just that -- standard errors for the OLS coefficients that are consistent in the presence of heteroscedasticity. The coefficients themselves don't change. There is an issue here: although the standard errors and OLS coefficients are consistent, the OLS estimates lose efficiency. If you know that pattern of heteroscedasticity, then you might get more efficient estimates by taking it into account, e.g., in weighted-least-squares regression, or, if the residual spread increases with the fitted values, by transforming the response. I hope this helps, John -- John Fox, Professor Department of Sociology McMaster University Hamilton, Ontario, Canada web: socserv.mcmaster.ca/jfox -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Kishore Sent: February-10-09 9:19 AM To: r-help@r-project.org; r-h...@stat.math.ethz.ch Subject: [R] Help regarding White's Heteroscedasticity Correction Hi I am actually running the White test for correcting Heteroscedasticity. I used sandwich() car(), however the output shows the updated t test of coefficients, with revised Standard Errors, however the estimates remained same. My problem is that the residuals formed a pattern in the original regression equation. After running the White's test, I got some new standard errors - but from here I didn't understand how to plot the residuals (or) how to correct the estimates?? Can some one direct me in this regard.. Best, Kishore/.. http://kaykayatisb.blogspot.com [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Problem with PVCM: 0 (non-NA) cases
Hello everybody, I have a problem with the the function PVCM in the plm package: I have an unbalanced panel with over 200 companies and 1 to 14 years for each company. I already excluded all NAs: dataset-na.omit(dataset) Now I'm trying to fit a variable coefficients model: model_vc - pvcm(v1 ~ lag(v2,1), model=within, data=dataset) This results in the following error message: Fehler in lm.fit(x, y, offset = offset, singular.ok = singular.ok, ...) : 0 (non-NA) cases I can't figure out what's wrong... Can somebody help me, please? Thanks so much! Johannes PS: Here's additional information on my dataset: str(dataset) Classes ‘plm.dim’ and 'data.frame': 1531 obs. of 4 variables: $ company: Factor w/ 210 levels 1164,1177,..: 1 1 1 1 1 1 1 1 1 1 ... $ year : Factor w/ 16 levels 1993,1994,..: 2 3 4 5 6 7 8 9 10 11 ... $ v1 : num 0.0993 0.1488 0.0604 0.0902 0.0573 ... $ v2 : int 75 75 78 72 74 73 70 70 70 67 ... - attr(*, na.action)=Class 'omit' Named int [1:979] 12 13 14 15 16 17 18 26 39 40 ... .. ..- attr(*, names)= chr [1:979] 12 13 14 15 ... summary(dataset) company year v1 v2 3121 : 15 2007 :136 Min. :-1.05746 Min. :49.00 8762 : 15 2006 :128 1st Qu.: 0.08706 1st Qu.:71.00 1382 : 14 2005 :125 Median : 0.12834 Median :76.00 1388 : 14 2003 :119 Mean : 0.13399 Mean :75.37 1440 : 14 2004 :119 3rd Qu.: 0.18909 3rd Qu.:80.00 1663 : 14 2002 :115 Max. : 0.71280 Max. :90.00 (Other):1445 (Other):789 -- View this message in context: http://www.nabble.com/Problem-with-PVCM%3A-%220-%28non-NA%29-cases%22-tp21933499p21933499.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] ISOdatetime gives NA for a specific date
pbarros wrote: Hi all, I am using ISOdatetime, and I just found out that when I do ISOdatetime(1995,03,26,2,10,0) (or any other value under minutes or seconds) I get NA This does not happen with the same time in other dates, nor with different hours in the same date. Any hint why this happens? Using R 2.8.1 under ESS/GnuEmacs under Windows XP Pedro Daylight savings time, I guess. The clock went directly from 1:59 to 3:00 that day. Other systems behave strangely (er, handle the anomaly) in different ways: ISOdatetime(1995,03,26,1,10,0) [1] 1995-03-26 01:10:00 CET ISOdatetime(1995,03,26,2,10,0) [1] 1995-03-26 01:10:00 CET ISOdatetime(1995,03,26,3,10,0) [1] 1995-03-26 03:10:00 CEST (SUSE 10.2) -- O__ Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~ - (p.dalga...@biostat.ku.dk) FAX: (+45) 35327907 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] ISOdatetime gives NA for a specific date
On Tue, 10 Feb 2009, pbarros wrote: Hi all, I am using ISOdatetime, and I just found out that when I do ISOdatetime(1995,03,26,2,10,0) (or any other value under minutes or seconds) I get NA This does not happen with the same time in other dates, nor with different hours in the same date. Any hint why this happens? A non-existent time, most likely: x - ISOdatetime(1995,03,26,1,10,0) x [1] 1995-03-26 01:10:00 CET seq(x, length=10, by=hour) [1] 1995-03-26 01:10:00 CET 1995-03-26 03:10:00 CEST [3] 1995-03-26 04:10:00 CEST 1995-03-26 05:10:00 CEST [5] 1995-03-26 06:10:00 CEST 1995-03-26 07:10:00 CEST [7] 1995-03-26 08:10:00 CEST 1995-03-26 09:10:00 CEST [9] 1995-03-26 10:10:00 CEST 1995-03-26 11:10:00 CEST in TZ=Europe/Lisbon, which is my guess as to near where you are There was no 2:10 on 1995-03-26 in Lisbon: the clocks went forward an hour at 2 am. Using R 2.8.1 under ESS/GnuEmacs under Windows XP Pedro -- Brian D. Ripley, rip...@stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UKFax: +44 1865 272595 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] pause in function execution
I tried using the command-line and indeed it does not buffer so that,
for example:
for (i in 1:5) {
print(x)
Sys.sleep(3) }
does as expected.
However, the following sleeps for 15 seconds and then produces no
output:
library(quantmod)
for (i in 1:5) {
getQuote(AAPL)
Sys.sleep(3) }
Why is that?
Thanks.
On Feb 9, 2009, at 8:04 PM, Rolf Turner wrote:
On 10/02/2009, at 1:46 PM, Fuchs Ira wrote:
The binary in R.app starts the GUI. I suppose I would have to install
the command-line version separately.
On my machine there is a ``file'' /usr/bin/R which is actually a
symbolic
link to /Library/Frameworks/R.framework/Resources/bin/R.
The latter is an executable shell script.
At the command line in a window you should be able to just type
R
or (if /usr/bin is not in your path)
/usr/bin/R
or (if the symbolic link is not present in /usr/bin)
/Library/Frameworks/R.framework/Resources/bin/R
and get R going. In such a way as not to invoke the AQUA GUI.
If this doesn't work, I'm afraid I'm out of ideas.
If the last option works, then you should create the symbolic link
in /usr/bin
(and make sure that /usr/bin is in your path). Then you'll be able
to start
simply by typing ``R''.
cheers,
Rolf Turner
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Re: [R] how to use axes=FALSE to get multple plots?
Duncan Murdoch-2 wrote: ...Are you really sure you want a graph with two different scales on it? Thanks, Duncan. I'll use mtext. It is common for people in my research area to put several axes on plots. The top two panels from library(oce) data(ctd) plot(ctd) shows this. Actually, oceanographers do something even stranger (not in my posted example) -- we put the dependent variables on the x axis, and colour-code the axes to the lines. Thanks again. Dan. -- View this message in context: http://www.nabble.com/how-to-use-axes%3DFALSE-to-get-multple-plots--tp21934005p21936243.html Sent from the R help mailing list archive at Nabble.com. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] pause in function execution
Oops...forgot to print(getQuote(AAPL). Sorry.
On Feb 10, 2009, at 10:21 AM, Fuchs Ira wrote:
I tried using the command-line and indeed it does not buffer so
that, for example:
for (i in 1:5) {
print(x)
Sys.sleep(3) }
does as expected.
However, the following sleeps for 15 seconds and then produces no
output:
library(quantmod)
for (i in 1:5) {
getQuote(AAPL)
Sys.sleep(3) }
Why is that?
Thanks.
On Feb 9, 2009, at 8:04 PM, Rolf Turner wrote:
On 10/02/2009, at 1:46 PM, Fuchs Ira wrote:
The binary in R.app starts the GUI. I suppose I would have to
install
the command-line version separately.
On my machine there is a ``file'' /usr/bin/R which is actually a
symbolic
link to /Library/Frameworks/R.framework/Resources/bin/R.
The latter is an executable shell script.
At the command line in a window you should be able to just type
R
or (if /usr/bin is not in your path)
/usr/bin/R
or (if the symbolic link is not present in /usr/bin)
/Library/Frameworks/R.framework/Resources/bin/R
and get R going. In such a way as not to invoke the AQUA GUI.
If this doesn't work, I'm afraid I'm out of ideas.
If the last option works, then you should create the symbolic link
in /usr/bin
(and make sure that /usr/bin is in your path). Then you'll be able
to start
simply by typing ``R''.
cheers,
Rolf Turner
##
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you are not theintended recipient please delete the message and
notify the sender.Any views or opinions presented are solely those
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[R] plotting the result of a nonlinear regression
Hello,
to plot the result of a singular non linear regression (using nls) I usually
use the function plotfit, for example:
r.PTG.V-nls(PTG.P~ fz1(Portata, a,b), data=dati, start=list(a=10, b=10),
nls.control(maxiter=200), algorithm='port',
trace=TRUE, na.action=na.omit, lower=list(a=0, b=10), upper=list(a=100, b=100))
plotfit(r.PTG.V)
I tried to use the function plotfit on the result of the following for loop but
I got an error message:
for (i in 1:length(formList))
{
resultList[[i]] - nls(formList[[i]], data=subset(dati, Fiume==Laveggio),
start=startList7[[i]],
nls.control(maxiter=1000, warnOnly=TRUE), algorithm='port',
na.action=na.omit,lower=lowerList7[[i]],
upper=upperList7[[i]])
}
plotfit(resultList[[1]]
Error in diff(as.numeric(y[ord])) :
(list) object cannot be coerced to type 'double'
Could somebody tell me what this error means? how can I fix this problem?
Any suggestion appreciated!!
Thanks,
Laura
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[R] how to add points/lines to a surface plot
Dear All,
is there a way to superimpose points and/or lines on a surface plot?
Below I try to explain my problem.
Suppose I have the following surface plot (likelikood for the normal
variable when both parameters are unknown):
---
normalLike - function(mu, sigma, sample){
(sigma ^ - length(sample)) * exp(-0.5 * (sigma ^ -2) * sum((sample -
mu)^2))
}
normalLikeVec - Vectorize(normalLike, vectorize.args = c(mu,sigma))
teta1 - seq(0, 6, by=0.1)
teta2 - seq(0.1, 8, by=0.1)
matrixMuSigma - outer(teta1, teta2, normalLikeVec, sample=c(0.88, 1.07,
1.27,1.54, 1.91, 2.27, 3.84, 4.50, 4.64, 9.41))
matrixMuSigma - matrixMuSigma / max(matrixMuSigma)
persp(teta1, teta2, matrixMuSigma)
---
Then I would like to superimpose on the same plot points (or a line)
corresponding to the following data:
---
#x coordinates
teta1
#y coordinates
sigmaMax - teta2[apply(matrixMuSigma, 1, which.max)]
#z coordinates
apply(matrixMuSigma, 1, max)
---
Thanks in advance,
domenico
PS:
I am trying to explain the geometrical interpretation of profile
likelihood. Any better idea?
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[R] summary of a list
Hello,
I'm using the following for loop to find regression curves using a list of
functions (formList), a list of starting
values (startList), uppervalues (upperList) and lower values (lowerList).
A sample of the list of function I use in the loop is the following:
FormList - list(PTG.P ~ fz1(Portata, a, b), PTG.P ~ fz2(Portata, a, b), PTG.P
~ fz3(Portata,a, b, d, e),
PTG.P ~ fz4(Portata, a, b), PTG.P ~ fz5(Portata, a, b, d), PO4.P ~ fz1(Portata,
a, b),
PO4.P ~ fz2(Portata, a, b), ...
And the loop I use is:
resultList - list()
for (i in 1:length(formList))
{
resultList[[i]] - nls(formList[[i]], data=subset(dati, Fiume==Laveggio),
start=startList[[i]],
nls.control(maxiter=1000, warnOnly=TRUE), algorithm='port',
na.action=na.omit,lower=lowerList[[i]],
upper=upperList[[i]])
}
When the computation ends I get 5 warning messages (one of false convergence, 4
of singular convergence:
In nls(formList[[i]], data = subset(dati, Fiume == Laveggio), : Convergence
failure: false convergence (8)
2: In nls(formList[[i]], data = subset(dati, Fiume == Laveggio), :
Convergence failure: singular convergence (7)
If I want to get the summary of the first object of the resultList I do:
summary(resultList[[1]])
And I get a result with no problem:
Formula: PTG.P ~ fz1(Portata, a, b)
Parameters:
Estimate Std. Error t value Pr(|t|)
a 61.158 18.591 3.290 0.00140 **
b7.616 8.720 0.873 0.38464
---
Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
Residual standard error: 91.32 on 96 degrees of freedom
Algorithm port, convergence message: both X-convergence and relative
convergence (5)
It also works if I try to get the summary of the first 5 object of the
resultList with:
summaryList-list()
for (i in 1:5)
{
summaryList[[i]]-summary(resultList[[i]])
}
But if I try to get the summary of all the objects of the resultList (there are
35 objects) it doesn't work...
I tried:
summaryList-list()
for (i in 1:length(resultList))
+ {
+ summaryList[[i]]-summary(resultList[[i]])
+ }
And I got the following error message:
Error in chol2inv(object$m$Rmat()) : l'elemento (3, 3) è zero, quindi l'inversa
non può essere calcolata
Which translated should be: Error in chol2inv(object$m$Rmat()): the element (3,
3) is zero (NULL?), that's why the
inverse (inverse function?) can not be computed
Does somebody have an idea on how to fix this?
Thanks
Laura
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Re: [R] ISOdatetime gives NA for a specific date
Thanks. Now I know how to handle it. It was killing me Pedro Prof Brian Ripley wrote: On Tue, 10 Feb 2009, pbarros wrote: Hi all, I am using ISOdatetime, and I just found out that when I do ISOdatetime(1995,03,26,2,10,0) (or any other value under minutes or seconds) I get NA This does not happen with the same time in other dates, nor with different hours in the same date. Any hint why this happens? A non-existent time, most likely: x - ISOdatetime(1995,03,26,1,10,0) x [1] 1995-03-26 01:10:00 CET seq(x, length=10, by=hour) [1] 1995-03-26 01:10:00 CET 1995-03-26 03:10:00 CEST [3] 1995-03-26 04:10:00 CEST 1995-03-26 05:10:00 CEST [5] 1995-03-26 06:10:00 CEST 1995-03-26 07:10:00 CEST [7] 1995-03-26 08:10:00 CEST 1995-03-26 09:10:00 CEST [9] 1995-03-26 10:10:00 CEST 1995-03-26 11:10:00 CEST in TZ=Europe/Lisbon, which is my guess as to near where you are There was no 2:10 on 1995-03-26 in Lisbon: the clocks went forward an hour at 2 am. Using R 2.8.1 under ESS/GnuEmacs under Windows XP Pedro -- Brian D. Ripley, rip...@stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UKFax: +44 1865 272595 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- View this message in context: http://www.nabble.com/ISOdatetime-gives-NA-for-a-specific-date-tp21934989p21936140.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Strange behaviour of ISOdatetime
Hi All, I am watching a strange behaviour of ISOdatetime. In my work computer, I get NA when I try to do ISOdatetime(1995,03,26,2,0,0) [1] NA But on other dates and/or times (hour) works OK ISOdatetime(1995,03,25,2,0,0) [1] 1995-03-25 02:00:00 GMT In my home computer, I do not have this problem. I am running the same version of R (2.8.1 patched) on both machines, the same version of Gnu Emacs (22.3.1) and the same version of ESS (5.3.10). Both are running Windows XP. Has anyone experienced this before? Pedro __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] ISOdatetime gives NA for a specific date
Thanks a lot. I will need to change the time to GMT, then, I guess (this is indeed GMT time). Pedro Daylight savings time, I guess. The clock went directly from 1:59 to 3:00 that day. Other systems behave strangely (er, handle the anomaly) in different ways: ISOdatetime(1995,03,26,1,10,0) [1] 1995-03-26 01:10:00 CET ISOdatetime(1995,03,26,2,10,0) [1] 1995-03-26 01:10:00 CET ISOdatetime(1995,03,26,3,10,0) [1] 1995-03-26 03:10:00 CEST (SUSE 10.2) -- O__ Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~ - (p.dalga...@biostat.ku.dk) FAX: (+45) 35327907 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- View this message in context: http://www.nabble.com/ISOdatetime-gives-NA-for-a-specific-date-tp21934989p21936112.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Strange behaviour of ISOdatetime
My guess is that your two machines have different setting for locale. What does this produce on each of them: sessionInfo()$locale (Note: It would have been part of the information that you were asked to provide per the posting guide.) --- For questions about unexpected behavior or a possible bug, you should, at a minimum, copy and paste the output from sessionInfo() into your message. When mentioning version numbers, always use the full version number, e.g., `2.6.1', not just `2.6', and also mention the platform (Windows, Linux, MacOS X, with their versions). Other potentially relevant details include the locale (type Sys.getlocale() at the R prompt), and whether you installed a pre-compiled binary version of R or compiled it yourself. -- David Winsemius On Feb 10, 2009, at 11:31 AM, Pedro de Barros wrote: Hi All, I am watching a strange behaviour of ISOdatetime. In my work computer, I get NA when I try to do ISOdatetime(1995,03,26,2,0,0) [1] NA But on other dates and/or times (hour) works OK ISOdatetime(1995,03,25,2,0,0) [1] 1995-03-25 02:00:00 GMT In my home computer, I do not have this problem. I am running the same version of R (2.8.1 patched) on both machines, the same version of Gnu Emacs (22.3.1) and the same version of ESS (5.3.10). Both are running Windows XP. Has anyone experienced this before? Pedro __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] how to add points/lines to a surface plot
See ?persp, particularly the example that starts with
# (2) Add to existing persp plot - using trans3d() :
Uwe Ligges
Domenico Vistocco wrote:
Dear All,
is there a way to superimpose points and/or lines on a surface plot?
Below I try to explain my problem.
Suppose I have the following surface plot (likelikood for the normal
variable when both parameters are unknown):
---
normalLike - function(mu, sigma, sample){
(sigma ^ - length(sample)) * exp(-0.5 * (sigma ^ -2) * sum((sample -
mu)^2))
}
normalLikeVec - Vectorize(normalLike, vectorize.args = c(mu,sigma))
teta1 - seq(0, 6, by=0.1)
teta2 - seq(0.1, 8, by=0.1)
matrixMuSigma - outer(teta1, teta2, normalLikeVec, sample=c(0.88, 1.07,
1.27,1.54, 1.91, 2.27, 3.84, 4.50, 4.64, 9.41))
matrixMuSigma - matrixMuSigma / max(matrixMuSigma)
persp(teta1, teta2, matrixMuSigma)
---
Then I would like to superimpose on the same plot points (or a line)
corresponding to the following data:
---
#x coordinates
teta1
#y coordinates
sigmaMax - teta2[apply(matrixMuSigma, 1, which.max)]
#z coordinates
apply(matrixMuSigma, 1, max)
---
Thanks in advance,
domenico
PS:
I am trying to explain the geometrical interpretation of profile
likelihood. Any better idea?
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[R] arithmetic comparison over corresponding values from two vectors
Hi, I have scenario in which I wish to check whether numeric values in one array falls within the range of numbers defined over corresponding values in two other vectors: starts = c(12,45,67,110) ends=c(24, 58,102,150) trgroup=c(18,87) The result should be 1,3 , indices of vector starts/ends. which(trgroup=starts trgroup=ends) wouldn't give required result. I don't want to write a for loop for doing this. Kindly help with ideas. Josh [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] summary of a list
lauramorgana at bluewin.ch lauramorgana at bluewin.ch writes: Hello, I'm using the following for loop to find regression curves using a list of functions (formList), a list of .. long non-reproducible code removed And I got the following error message: Error in chol2inv(object$m$Rmat()) : l'elemento (3, 3) è zero, quindi l'inversa non può essere calcolata Which translated should be: Error in chol2inv(object$m$Rmat()): the element (3, 3) is zero (NULL?), that's why the inverse (inverse function?) can not be computed nls is rather nasty or nice in telling you when the result should not be trusted. Other software gives nonsense result without blinking. In package nlme, there is a function nlsList which does directly what you want, but there is little help besides revising the model for the cases without convergence. Also try check Gabor Grothendieks package nls2 which could help you finding better start values. Dieter __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] plotting the result of a nonlinear regression
?predict
On Tue, Feb 10, 2009 at 11:06 AM, lauramorg...@bluewin.ch
lauramorg...@bluewin.ch wrote:
Hello,
to plot the result of a singular non linear regression (using nls) I usually
use the function plotfit, for example:
r.PTG.V-nls(PTG.P~ fz1(Portata, a,b), data=dati, start=list(a=10, b=10),
nls.control(maxiter=200), algorithm='port',
trace=TRUE, na.action=na.omit, lower=list(a=0, b=10), upper=list(a=100,
b=100))
plotfit(r.PTG.V)
I tried to use the function plotfit on the result of the following for loop
but I got an error message:
for (i in 1:length(formList))
{
resultList[[i]] - nls(formList[[i]], data=subset(dati,
Fiume==Laveggio), start=startList7[[i]],
nls.control(maxiter=1000, warnOnly=TRUE), algorithm='port',
na.action=na.omit,lower=lowerList7[[i]],
upper=upperList7[[i]])
}
plotfit(resultList[[1]]
Error in diff(as.numeric(y[ord])) :
(list) object cannot be coerced to type 'double'
Could somebody tell me what this error means? how can I fix this problem?
Any suggestion appreciated!!
Thanks,
Laura
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Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
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Re: [R] Help regarding White's Heteroscedasticity Correction
or simultaneously estimate the coefficients and variance structure via nlme::gls and its 'weights' argument... On Tue, Feb 10, 2009 at 7:57 AM, John Fox j...@mcmaster.ca wrote: Dear Kishore, Yes, White's heteroscedasticity-consistent standard errors are just that -- standard errors for the OLS coefficients that are consistent in the presence of heteroscedasticity. The coefficients themselves don't change. There is an issue here: although the standard errors and OLS coefficients are consistent, the OLS estimates lose efficiency. If you know that pattern of heteroscedasticity, then you might get more efficient estimates by taking it into account, e.g., in weighted-least-squares regression, or, if the residual spread increases with the fitted values, by transforming the response. I hope this helps, John -- John Fox, Professor Department of Sociology McMaster University Hamilton, Ontario, Canada web: socserv.mcmaster.ca/jfox -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Kishore Sent: February-10-09 9:19 AM To: r-help@r-project.org; r-h...@stat.math.ethz.ch Subject: [R] Help regarding White's Heteroscedasticity Correction Hi I am actually running the White test for correcting Heteroscedasticity. I used sandwich() car(), however the output shows the updated t test of coefficients, with revised Standard Errors, however the estimates remained same. My problem is that the residuals formed a pattern in the original regression equation. After running the White's test, I got some new standard errors - but from here I didn't understand how to plot the residuals (or) how to correct the estimates?? Can some one direct me in this regard.. Best, Kishore/.. http://kaykayatisb.blogspot.com [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] arithmetic comparison over corresponding values from two vectors
on 02/10/2009 11:02 AM T Joshi wrote: Hi, I have scenario in which I wish to check whether numeric values in one array falls within the range of numbers defined over corresponding values in two other vectors: starts = c(12,45,67,110) ends=c(24, 58,102,150) trgroup=c(18,87) The result should be 1,3 , indices of vector starts/ends. which(trgroup=starts trgroup=ends) wouldn't give required result. I don't want to write a for loop for doing this. Kindly help with ideas. Josh Try this: sapply(trgroup, function(x) which((x = starts) (x = ends))) [1] 1 3 HTH, Marc Schwartz __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] R running as a server on windows?
Nobody can help with this question (or tell me where I can find help) ? Antje schrieb: Hi there, I'm not sure whether this is the right mailing list to put this question... if not, please tell me where I can find help. I have a spare dual-core machine which run Windows XP Professional and is nearly unused (nearly! Unfortunately, I cannot change OS). And I'm investigating Knime (knime.org) to set up data analysis workflows. They have some nodes to execute R on a remote machine. Is it possible to run R on this windows machine, so that I can call it from somewhere else? Antje __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] arithmetic comparison over corresponding values from two vectors
sapply(trgroup, function(x) which(x=starts x =ends)) works for your example data, but there's probably a better way HTH KJ T Joshi tejalonl...@gmail.com wrote in message news:11417a880902100902w53664a3dq11aee64a963d8...@mail.gmail.com... Hi, I have scenario in which I wish to check whether numeric values in one array falls within the range of numbers defined over corresponding values in two other vectors: starts = c(12,45,67,110) ends=c(24, 58,102,150) trgroup=c(18,87) The result should be 1,3 , indices of vector starts/ends. which(trgroup=starts trgroup=ends) wouldn't give required result. I don't want to write a for loop for doing this. Kindly help with ideas. Josh __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] how to add points/lines to a surface plot
In this case, following your instructions and a bit of noodling with
the example solves the problem with:
persp(teta1, teta2, matrixMuSigma) - res
points(trans3d( teta1, sigmaMax, apply(matrixMuSigma, 1, max),
pmat=res), col=red)
--
David Winsemius
On Feb 10, 2009, at 11:50 AM, Uwe Ligges wrote:
See ?persp, particularly the example that starts with
# (2) Add to existing persp plot - using trans3d() :
Uwe Ligges
Domenico Vistocco wrote:
Dear All,
is there a way to superimpose points and/or lines on a surface plot?
Below I try to explain my problem.
Suppose I have the following surface plot (likelikood for the
normal variable when both parameters are unknown):
--- normalLike
- function(mu, sigma, sample){
(sigma ^ - length(sample)) * exp(-0.5 * (sigma ^ -2) *
sum((sample - mu)^2))
}
normalLikeVec - Vectorize(normalLike, vectorize.args =
c(mu,sigma))
teta1 - seq(0, 6, by=0.1)
teta2 - seq(0.1, 8, by=0.1)
matrixMuSigma - outer(teta1, teta2, normalLikeVec, sample=c(0.88,
1.07, 1.27,1.54, 1.91, 2.27, 3.84, 4.50, 4.64, 9.41))
matrixMuSigma - matrixMuSigma / max(matrixMuSigma)
persp(teta1, teta2, matrixMuSigma)
--- Then
I would like to superimpose on the same plot points (or a line)
corresponding to the following data:
--- #x
coordinates
teta1
#y coordinates
sigmaMax - teta2[apply(matrixMuSigma, 1, which.max)]
#z coordinates
apply(matrixMuSigma, 1, max)
--- Thanks
in advance,
domenico
PS:
I am trying to explain the geometrical interpretation of profile
likelihood. Any better idea?
__
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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Re: [R] arithmetic comparison over corresponding values from two vectors
On Tue, 10 Feb 2009, Keith Jewell wrote: sapply(trgroup, function(x) which(x=starts x =ends)) works for your example data, but there's probably a better way For large scale problems this works well: http://finzi.psych.upenn.edu/R/Rhelp02a/archive/60815.html HTH, Chuck HTH KJ T Joshi tejalonl...@gmail.com wrote in message news:11417a880902100902w53664a3dq11aee64a963d8...@mail.gmail.com... Hi, I have scenario in which I wish to check whether numeric values in one array falls within the range of numbers defined over corresponding values in two other vectors: starts = c(12,45,67,110) ends=c(24, 58,102,150) trgroup=c(18,87) The result should be 1,3 , indices of vector starts/ends. which(trgroup=starts trgroup=ends) wouldn't give required result. I don't want to write a for loop for doing this. Kindly help with ideas. Josh __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Charles C. Berry(858) 534-2098 Dept of Family/Preventive Medicine E mailto:cbe...@tajo.ucsd.edu UC San Diego http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] R running as a server on windows?
Antje wrote: Nobody can help with this question (or tell me where I can find help) ? Antje schrieb: Hi there, I'm not sure whether this is the right mailing list to put this question... if not, please tell me where I can find help. I have a spare dual-core machine which run Windows XP Professional and is nearly unused (nearly! Unfortunately, I cannot change OS). And I'm investigating Knime (knime.org) to set up data analysis workflows. They have some nodes to execute R on a remote machine. Is it possible to run R on this windows machine, so that I can call it from somewhere else? Call from somewhere else is somewhat unspecific. Anyway, there are several ways: - Work using a Remote Desktop Connection (as I do for maintaining the CRAN windows builder, for example). - Install some secure shell server and work command line based. - Install some framework that allows to start processes on that machine as a node in a computer cluster (such as mpi) - this is not that easy on Windows and you always need a lucky combination of libraries (mpi/Rmpi and so on) that work together. Uwe Ligges Antje __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] R running as a server on windows?
Did you try the forums on Knime? That might be a better bet. -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Antje Sent: Tuesday, February 10, 2009 12:24 PM To: r-h...@stat.math.ethz.ch Subject: Re: [R] R running as a server on windows? Nobody can help with this question (or tell me where I can find help) ? Antje schrieb: Hi there, I'm not sure whether this is the right mailing list to put this question... if not, please tell me where I can find help. I have a spare dual-core machine which run Windows XP Professional and is nearly unused (nearly! Unfortunately, I cannot change OS). And I'm investigating Knime (knime.org) to set up data analysis workflows. They have some nodes to execute R on a remote machine. Is it possible to run R on this windows machine, so that I can call it from somewhere else? Antje __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- This message w/attachments (message) may be privileged, confidential or proprietary, and if you are not an intended recipient, please notify the sender, do not use or share it and delete it. Unless specifically indicated, this message is not an offer to sell or a solicitation of any investment products or other financial product or service, an official confirmation of any transaction, or an official statement of Merrill Lynch. Subject to applicable law, Merrill Lynch may monitor, review and retain e-communications (EC) traveling through its networks/systems. The laws of the country of each sender/recipient may impact the handling of EC, and EC may be archived, supervised and produced in countries other than the country in which you are located. This message cannot be guaranteed to be secure or error-free. References to Merrill Lynch are references to any company in the Merrill Lynch Co., Inc. group of companies, which are wholly-owned by Bank of America Corporation. Secu! rities and Insurance Products: * Are Not FDIC Insured * Are Not Bank Guaranteed * May Lose Value * Are Not a Bank Deposit * Are Not a Condition to Any Banking Service or Activity * Are Not Insured by Any Federal Government Agency. Attachments that are part of this E-communication may have additional important disclosures and disclaimers, which you should read. This message is subject to terms available at the following link: http://www.ml.com/e-communications_terms/. By messaging with Merrill Lynch you consent to the foregoing. -- __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] R running as a server on windows?
I, for one, don't fully understand the question, and while there are many on this list that are much smarter than I am, they may also have trouble understanding the question. At first glance it looks like you are asking if R runs on Windows XP (the answer is yes, but this seems to simple to be the real question). Are you asking about knime? Then you should ask on a forum about knime. If you are asking about ways to run R as a server on a windows machine, then look at the nws package. It takes a bit of setting up (including installing python and some addons to that, starting a server, etc.), but may do what you want. I have no idea if it interacts with knime at all. If this does not help, then try rephrasing the question or asking somewhere where there are more knime users, -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.s...@imail.org 801.408.8111 -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- project.org] On Behalf Of Antje Sent: Tuesday, February 10, 2009 10:24 AM To: r-h...@stat.math.ethz.ch Subject: Re: [R] R running as a server on windows? Nobody can help with this question (or tell me where I can find help) ? Antje schrieb: Hi there, I'm not sure whether this is the right mailing list to put this question... if not, please tell me where I can find help. I have a spare dual-core machine which run Windows XP Professional and is nearly unused (nearly! Unfortunately, I cannot change OS). And I'm investigating Knime (knime.org) to set up data analysis workflows. They have some nodes to execute R on a remote machine. Is it possible to run R on this windows machine, so that I can call it from somewhere else? Antje __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting- guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] loglik and arima()
All - I am evaluating an arima(2,1,3) and arima(3,1,3) and notice the log-likelihood of the restricted model is higher than the log-likelihood of the unrestricted. Since these are nested models, I thought the unrestricted model would have a log-likelihood at least as large as that of the restricted model. Am I interpreting the loglik output incorrectly? Regards, Stephen Collins, MPP | Analyst Health Benefits | Aon Consulting 200 East Randolph, Suite 900, Chicago, IL Tel: 312-381-2578 | Fax: 312-381-0136 Email: stephen_coll...@aon.com Aon Consulting selected by the readers of Business Insurance as the âBest Employee Benefit Consulting Firmâ in 2006, 2007, and 2008 NOTE: The information contained in this transmission, including any attachment(s) is only for the use of the intended individual(s) or entity, and may contain information that is privileged and confidential. If the reader of this message is not an intended recipient, you are hereby notified that any dissemination, distribution, disclosure, or copying of this information is unauthorized and strictly prohibited. If you have received this communication in error, please contact the sender immediately by reply email and destroy all copies of the original message. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Strange behaviour of ISOdatetime
Have you checked that that time exists in the time zone you are using? From ?ISOdatetime: Note ... Remember that in most timezones some times do not occur and some occur twice because of transitions to/from summer time. What happens in those cases is OS-specific. You could try working out what your system is using as the transition to/from summer time. (If you need to generate times that are 2 hours after midnight, try using ISOdatetime to generate the midnight times and add 2 hours). On my system, all this works fine: ISOdatetime(1995,03,26,2,0,0) [1] 1995-03-26 02:00:00 MST ISOdatetime(1995,03,26,0,0,0) + 2 * 60 * 60 [1] 1995-03-26 02:00:00 MST sessionInfo() R version 2.8.1 (2008-12-22) i386-pc-mingw32 locale: LC_COLLATE=English_United States.1252;LC_CTYPE=English_United States.1252;LC_MONETARY=English_United States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252 attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] TimeWarp_0.7abind_1.2-0 trackObjs_0.8-0 tap.misc_1.0 [5] bmc.misc_1.0RtTests_0.1-5 -- Tony Plate Pedro de Barros wrote: Hi All, I am watching a strange behaviour of ISOdatetime. In my work computer, I get NA when I try to do ISOdatetime(1995,03,26,2,0,0) [1] NA But on other dates and/or times (hour) works OK ISOdatetime(1995,03,25,2,0,0) [1] 1995-03-25 02:00:00 GMT In my home computer, I do not have this problem. I am running the same version of R (2.8.1 patched) on both machines, the same version of Gnu Emacs (22.3.1) and the same version of ESS (5.3.10). Both are running Windows XP. Has anyone experienced this before? Pedro __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Rterm.exe stops responding to keyboard input
I've been trying to use Rterm.exe, mainly because of Rgui.exe's lack of support for incremental history searching. But on my system (Win XP, SP3), it (rterm from R-2.8.1) frequently just stops responding to keyboard input. This happens often (enough to make it unusable), and generally after a switch to another window. It doesn't seem to hang exactly, as if I leave it a while (minutes) it sometimes starts responding again. It isn't using any CPU to speak of whilst being mute. Anyone else know of this? [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] R on Mobile Devices (Android)
Harsh wrote: At the cost of sounding far-fetched and almost incredulous, I would like to know if any R user is remotely considering the use of R on Mobile devices, and Android in particular. In addition to the other objections in the other replies, I add this one: the assignment operator and the parens are up on ALT keys on the Android keyboard. Typing R expressions would be pretty painful. You can demo this by installing an ssh client and logging in remotely to a machine with R on it, and trying to use it remotely. A local one wouldn't be better...it might not even be faster, because the faster CPU on the machine running R might matter more than the speed of the network link between client and server. I briefly thought of what it would take to port R to an iPhone or iPod touch, and the keyboard issues would be even worse. Bottom line, R has the idiom of a real keyboard written into its bones. To be popular, a statistical analysis tool for such devices would have to work differently, taking advantage of the platform's native input mechanisms. mobile phone would allow for micro statistics to be collected from the log files reflecting number of calls dropped, average time spent talking, a time series of the amount of time taken for battery recharge, and a host of other information that could be collated and analyzed. I agree with the other person that the program to write to cover this case would be just a stat gatherer, which somehow gets the data off the device for analysis by R running elsewhere. It could be a web service, or you could write a CSV file that somehow gets downloaded from the device for use on the computer the phone syncs to. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] R running as a server on windows?
Yes you can run the Rserve application on a remote computer in e.g network and then you can connect it from your Desktop computer. I've done this already with a remote Linux computer (Rserve is running very stable on a Linux computer). For example i clustered an R,G,B image on a linux computer with R to make use of the additional RAM without to load my Desktop application (The remote connection will be a new feature in the next release of my application). If the mentioned application uses Rserve and can be configured with an ip adress etc. it should be easily possible. Please read the information how to config Rserve(and read the security info carefully!) on the Rserve website: http://www.rforge.net/Rserve/ http://www.rforge.net/Rserve/ -Documentation I hope this information helps! Best regards Marcel -- View this message in context: http://www.nabble.com/R-running-as-a-server-on-windows--tp21929048p21939495.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Rterm.exe stops responding to keyboard input
Hi, this sounds awfully similar to what I reported in r-help thread '[R] Windows Vista, Rterm LeftAlt + Tab issue' on Aug 21, 2008, cf. https://stat.ethz.ch/pipermail/r-help/2008-August/171548.html At least we are not alone ;) ...and I though it was an issue with Windows Vista only, because I didn't notice any problem with Windows XP Pro I had before. It might have been that I only had SP 2 (I think), so it may be related to post-SP 2 updates that are also included in Vista. In Windows, you can shift between applications using either LeftAlt+TAB or RightAlt+TAB, but I discovered that the freezing problem only occurred with LeftAlt+TAB, which is the combination I use most frequently. I ended up remapping the physical left-most Alt key (on a US keyboard) to signal Right Alt (and vice versa for the right-most Alt key). I used KeyTweak [http://webpages.charter.net/krumsick/] do this. Since then I've forgot about the issue, so I guess it works to circumvent the problem. Let us know if this solves your problem Henrik On Tue, Feb 10, 2009 at 10:54 AM, CB cb.li...@gmail.com wrote: I've been trying to use Rterm.exe, mainly because of Rgui.exe's lack of support for incremental history searching. But on my system (Win XP, SP3), it (rterm from R-2.8.1) frequently just stops responding to keyboard input. This happens often (enough to make it unusable), and generally after a switch to another window. It doesn't seem to hang exactly, as if I leave it a while (minutes) it sometimes starts responding again. It isn't using any CPU to speak of whilst being mute. Anyone else know of this? [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] How to split a character vector into 3 vectors
Hi , Does any one know how to split a character vector , I have a vector X that looks like this and each row has 3 characters X ASK DGH ASG AUJ FRT I would like to split the vector into 3 vectors that look like this X1 X2 X3 A S K D G H A S G A U J U R T thanks -- View this message in context: http://www.nabble.com/How-to-split-a-character-vector-into-3-vectors-tp21939492p21939492.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] forestplot
Dear R users, Is there any way to control the size of the box around the mean when creating a Forest plot using the forestplot function? regards Mark Mark T. Marino, MD VP, Early Clinical Development Mannkind Corp. 61 S. Paramus Road Paramus, NJ 07652 201-983-5238 Office 203-512-4008 Cell mmar...@mannkindcorp.com [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] How to split a character vector into 3 vectors
Dear kayj, Try this: X-c(ASK, DGH, ASG, AUJ, FRT) res-data.frame(do.call(rbind,strsplit(X,))) colnames(res)-paste(X,1:ncol(res),sep=) res HTH, Jorge On Tue, Feb 10, 2009 at 1:50 PM, kayj kjaj...@yahoo.com wrote: Hi , Does any one know how to split a character vector , I have a vector X that looks like this and each row has 3 characters X ASK DGH ASG AUJ FRT I would like to split the vector into 3 vectors that look like this X1 X2 X3 A S K D G H A S G A U J U R T thanks -- View this message in context: http://www.nabble.com/How-to-split-a-character-vector-into-3-vectors-tp21939492p21939492.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] How to split a character vector into 3 vectors
See ?strsplit Hope this is helpful, Dan Daniel J. Nordlund Washington State Department of Social and Health Services Planning, Performance, and Accountability Research and Data Analysis Division Olympia, WA 98504-5204 -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of kayj Sent: Tuesday, February 10, 2009 10:50 AM To: r-help@r-project.org Subject: [R] How to split a character vector into 3 vectors Hi , Does any one know how to split a character vector , I have a vector X that looks like this and each row has 3 characters X ASK DGH ASG AUJ FRT I would like to split the vector into 3 vectors that look like this X1X2 X3 A S K D G H A S G A U J U R T thanks -- View this message in context: http://www.nabble.com/How-to-split-a-character-vector-into-3-v ectors-tp21939492p21939492.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] cwhmisc package requests update all the time!
Nguyen Dinh Nguyen n.nguyen at garvan.org.au writes: Dear Christian, Every single time check update package, “cwhmisc” always requests updating. I’m aware that the package was latest updated in CRAN on 20Nov2008. Is there anything wrong with my R library or somethingelse? I use R 2.8.1 on Window XP service pack 2 Have you installed packages in more than one place? I think I've experienced such a phenomenon where R detected that I had an old copy in a non-standard place, but updated the version in the default library location instead (and hence asked to update it again the next time). If you post some more information about installed package versions, lib.loc, etc. you might get a better diagnosis ... Ben Bolker __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] How to split a character vector into 3 vectors
kayj wrote: Hi , Does any one know how to split a character vector , I have a vector X that looks like this and each row has 3 characters X ASK DGH ASG AUJ FRT I would like to split the vector into 3 vectors that look like this X1X2 X3 A S K D G H A S G A U J U R T thanks If I understand you correctly, you have this vector: x - c(ASK, DGH, ASG, AUJ, URT) This code seems to do what you want: x1 - substr(x, 1, 1) x2 - substr(x, 2, 2) x3 - substr(x, 3, 3) There's probably a much simpler and more elegant way to do it, though. -- View this message in context: http://www.nabble.com/How-to-split-a-character-vector-into-3-vectors-tp21939492p21939521.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] How to split a character vector into 3 vectors
Another option is: read.table(textConnection(gsub((\\w), \\1;, X)), sep = ;) On Tue, Feb 10, 2009 at 4:50 PM, kayj kjaj...@yahoo.com wrote: Hi , Does any one know how to split a character vector , I have a vector X that looks like this and each row has 3 characters X ASK DGH ASG AUJ FRT I would like to split the vector into 3 vectors that look like this X1 X2 X3 A S K D G H A S G A U J U R T thanks -- View this message in context: http://www.nabble.com/How-to-split-a-character-vector-into-3-vectors-tp21939492p21939492.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40 S 49° 16' 22 O [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] loglik and arima()
hi: maybe it's minimizing the negative of the likeihood rather than maximizing the likelihood ? other than that, i don't see that being possible because of what you said. see what happens if you estimate an arima(1,1,3) ? On Tue, Feb 10, 2009 at 12:51 PM, Stephen Collins wrote: All - I am evaluating an arima(2,1,3) and arima(3,1,3) and notice the log-likelihood of the restricted model is higher than the log-likelihood of the unrestricted. Since these are nested models, I thought the unrestricted model would have a log-likelihood at least as large as that of the restricted model. Am I interpreting the loglik output incorrectly? Regards, Stephen Collins, MPP | Analyst Health Benefits | Aon Consulting 200 East Randolph, Suite 900, Chicago, IL Tel: 312-381-2578 | Fax: 312-381-0136 Email: stephen_coll...@aon.com Aon Consulting selected by the readers of Business Insurance as the ���Best Employee Benefit Consulting Firm��� in 2006, 2007, and 2008 NOTE: The information contained in this transmission, including any attachment(s) is only for the use of the intended individual(s) or entity, and may contain information that is privileged and confidential. If the reader of this message is not an intended recipient, you are hereby notified that any dissemination, distribution, disclosure, or copying of this information is unauthorized and strictly prohibited. If you have received this communication in error, please contact the sender immediately by reply email and destroy all copies of the original message. [[alternative HTML version deleted]] -- __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Rterm.exe stops responding to keyboard input
Henrik, Ah, I did briefly search the list archive, but hadn't come across your earlier post, sorry. I can confirm the conditions you outlined back then (ie. it's L-ALT+TAB, and only that, that causes the problem, that on return to rterm I can use ctrl-C to interrupt a running R call but then no further keyboard input). Rather than remapping the key (just being lazy) I've found another workaround -- a couple of taps on the left-ALT key whilst focus is on the Rterm window seems to revive Rterm for me. Thanks for the left-ALT tip. I hadn't noticed that the problem was specific to this means of switching windows. Cheers, CB. 2009/2/11 Crispin Bennett cris...@cb-ss.net Henrik, Ah, I did briefly search the list archive, but hadn't come across your earlier post, sorry. I can confirm the conditions you outlined back then (ie. it's L-ALT+TAB, and only that, that causes the problem, that on return to rterm I can use ctrl-C to interrupt a running R call but then no further keyboard input). Rather than remapping the key (just being lazy) I've found another workaround -- a couple of taps on the left-ALT key whilst focus is on the Rterm window seems to revive Rterm for me. Thanks for the left-ALT tip. I hadn't noticed that the problem was specific to this means of switching windows. Cheers, CB. 2009/2/11 Henrik Bengtsson h...@stat.berkeley.edu Hi, this sounds awfully similar to what I reported in r-help thread '[R] Windows Vista, Rterm LeftAlt + Tab issue' on Aug 21, 2008, cf. https://stat.ethz.ch/pipermail/r-help/2008-August/171548.html At least we are not alone ;) ...and I though it was an issue with Windows Vista only, because I didn't notice any problem with Windows XP Pro I had before. It might have been that I only had SP 2 (I think), so it may be related to post-SP 2 updates that are also included in Vista. In Windows, you can shift between applications using either LeftAlt+TAB or RightAlt+TAB, but I discovered that the freezing problem only occurred with LeftAlt+TAB, which is the combination I use most frequently. I ended up remapping the physical left-most Alt key (on a US keyboard) to signal Right Alt (and vice versa for the right-most Alt key). I used KeyTweak [http://webpages.charter.net/krumsick/] do this. Since then I've forgot about the issue, so I guess it works to circumvent the problem. Let us know if this solves your problem Henrik On Tue, Feb 10, 2009 at 10:54 AM, CB cb.li...@gmail.com wrote: I've been trying to use Rterm.exe, mainly because of Rgui.exe's lack of support for incremental history searching. But on my system (Win XP, SP3), it (rterm from R-2.8.1) frequently just stops responding to keyboard input. This happens often (enough to make it unusable), and generally after a switch to another window. It doesn't seem to hang exactly, as if I leave it a while (minutes) it sometimes starts responding again. It isn't using any CPU to speak of whilst being mute. Anyone else know of this? [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] rscript write function
Hi, I have this very simple two-line script : test.r: print (abc); write(def,test.txt); When run with rscript.exe --vanilla test.r (or just rscript.exe test.r), I get the abc output in the shell but no file is created in the directory I noticed that the only time the test.txt gets written is when the test.r script is placed in the bin directory where rscript.exe resides. I want a way to execute my test.r script and output the corresponding file in another directory, without having to copy the rscript.exe and dlls to that directory. I hope there is a way!! (I have this constraint because I am developping a website that connects with R and my script resides in a session folder created dynamically for every user...) Thanks! -- View this message in context: http://www.nabble.com/rscript-write-function-tp21940621p21940621.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] rscript write function
OK, obviously that was a silly question... SOLUTION: just specify the path in the write function...! Sorry ! Applejus wrote: Hi, I have this very simple two-line script : test.r: print (abc); write(def,test.txt); When run with rscript.exe --vanilla test.r (or just rscript.exe test.r), I get the abc output in the shell but no file is created in the directory I noticed that the only time the test.txt gets written is when the test.r script is placed in the bin directory where rscript.exe resides. I want a way to execute my test.r script and output the corresponding file in another directory, without having to copy the rscript.exe and dlls to that directory. I hope there is a way!! (I have this constraint because I am developping a website that connects with R and my script resides in a session folder created dynamically for every user...) Thanks! -- View this message in context: http://www.nabble.com/rscript-write-function-tp21940621p21942388.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] forestplot
Marino, Mark wrote: Dear R users, Is there any way to control the size of the box around the mean when creating a Forest plot using the forestplot function? H, forestplot Error: object 'forestplot' not found PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Uwe Ligges regards Mark Mark T. Marino, MD VP, Early Clinical Development Mannkind Corp. 61 S. Paramus Road Paramus, NJ 07652 201-983-5238 Office 203-512-4008 Cell mmar...@mannkindcorp.com [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Mixed ANCOVA with between-Ss covariate?
Hi all,
I have data from an experiment with 3 independent variables, 2 are
within and 1 is between. In addition to the dependent variable, I have
a covariate that is a single measure per subject. Below I provide an
example generated data set and my approach to implementing the ANCOVA.
However the output confuses me; why does the covariate only appear in
the first strata? Presumably it should appear in every strata in which
there can be between-Ss effects or interactions with between-Ss
effects, no?
#generate data
set.seed(1)
a=rbind(
expand.grid(
id=1:20
,iv1 = 1:2
,iv2 = 1:2
)
)
a$group = factor(a$id11)
a$dv = rnorm(length(a[,1]))
a$covariate = NA
for(i in unique(a$id)){
a$covariate[a$id==i]= rnorm(1)
}
#make sure id, iv1, and iv2 are factorized
a$id=factor(a$id)
a$iv1=factor(a$iv1)
a$iv2=factor(a$iv2)
#run ANCOVA
covariate_aov = aov(dv~covariate+group*iv1*iv2+Error(id/(iv1*iv2)),data=a)
summary(covariate_aov)
--
Mike Lawrence
Graduate Student
Department of Psychology
Dalhousie University
www.thatmike.com
Looking to arrange a meeting? Check my public calendar:
http://www.thatmike.com/mikes-public-calendar
~ Certainty is folly... I think. ~
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
[R] Putting values and axis X labels on the charts based on allEffects
Dear everybody! Need help with graphics. I am runnig a simple lm and then using allEffects from 'effects' package: require(effects) model-lm(Y~A+B, data=mydataframe) I am trying to build (for each predictor - A and then B) a plot of means on Y. I was successful doing it like this - in one swoop: ml.eff-allEffects(ml1, se=F) plot(ml.eff,ylab=Title of Y) Is it possible to show on my graph: 1. The actual Y values for each dot. 2. The title for A on the A graph and the title for B on the B graph - but without having to do it one by one - because in reality I have more predictors than one. Thank you very much! -- Dimitri Liakhovitski MarketTools, Inc. dimitri.liakhovit...@markettools.com __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] OT: A test with dependent samples.
I am appealing to the general collective wisdom of this
list in respect of a statistics (rather than R) question. This question
comes to me from a friend who is a veterinary oncologist. In a study
that
she is writing up there were 73 cats who were treated with a drug called
piroxicam. None of the cats were observed to be subject to vomiting
prior
to treatment; 12 of the cats were subject to vomiting after treatment
commenced. She wants to be able to say that the treatment had a
``significant''
impact with respect to this unwanted side-effect.
Initially she did a chi-squared test. (Presumably on the matrix
matrix(c(73,0,61,12),2,2) --- she didn't give details and I didn't
pursue
this.) I pointed out to her that because of the dependence --- same 73
cats pre- and post- treatment --- the chi-squared test is inappropriate.
So what *is* appropriate? There is a dependence structure of some sort,
but it seems to me to be impossible to estimate.
After mulling it over for a long while (I'm slow!) I decided that a
non-parametric approach, along the following lines, makes sense:
We have 73 independent pairs of outcomes (a,b) where a or b is 0
if the cat didn't barf, and is 1 if it did barf.
We actually observe 61 (0,0) pairs and 12 (0,1) pairs.
If there is no effect from the piroxicam, then (0,1) and (1,0) are
equally likely. So given that the outcome is in {(0,1),(1,0)} the
probability of each is 1/2.
Thus we have a sequence of 12 (0,1)-s where (under the null hypothesis)
the probability of each entry is 1/2. Hence the probability of this
sequence is (1/2)^12 = 0.00024. So the p-value of the (one-sided) test
is 0.00024. Hence the result is ``significant'' at the usual levels,
and my vet friend is happy.
I would very much appreciate comments on my reasoning. Have I made any
goof-ups, missed any obvious pit-falls? Gone down a wrong garden path?
Is there a better approach?
Most importantly (!!!): Is there any literature in which this
approach is
spelled out? (The journal in which she wishes to publish will almost
surely
demand a citation. They *won't* want to see the reasoning spelled
out in
the paper.)
I would conjecture that this sort of scenario must arise reasonably
often
in medical statistics and the suggested approach (if it is indeed valid
and sensible) would be ``standard''. It might even have a name! But I
have no idea where to start looking, so I thought I'd ask this
wonderfully
learned list.
Thanks for any input.
cheers,
Rolf Turner
##
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and provide commented, minimal, self-contained, reproducible code.
[R] [ANN] ggplot2 + rggobi course. July 30-31, Washington DC
Hi everyone, We're very pleased to offer a two-day looking-at-data course. July 30-31 Washington DC Day one: static graphics with ggplot2 Day two: interactive graphics with rggobi and GGobi. You can attend one day (for $295) or both days (for $550). Student discounts are available. All proceeds go to the GGobi Foundation to support graphics research. Find out more, and book your tickets online at http://lookingatdata.com Regards, Hadley Wickham Dianne Cook -- http://had.co.nz/ __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] OT: A test with dependent samples.
In the biomedical arena, at least as I learned from Rosner's
introductory text, the usual approach to analyzing paired 2 x 2 tables
is McNemar's test.
?mcnemar.test
mcnemar.test(matrix(c(73,0,61,12),2,2))
McNemar's Chi-squared test with continuity correction
data: matrix(c(73, 0, 61, 12), 2, 2)
McNemar's chi-squared = 59.0164, df = 1, p-value = 1.564e-14
The help page has citation to Agresti.
--
David winsemius
On Feb 10, 2009, at 4:33 PM, Rolf Turner wrote:
I am appealing to the general collective wisdom of this
list in respect of a statistics (rather than R) question. This
question
comes to me from a friend who is a veterinary oncologist. In a
study that
she is writing up there were 73 cats who were treated with a drug
called
piroxicam. None of the cats were observed to be subject to vomiting
prior
to treatment; 12 of the cats were subject to vomiting after treatment
commenced. She wants to be able to say that the treatment had a
``significant''
impact with respect to this unwanted side-effect.
Initially she did a chi-squared test. (Presumably on the matrix
matrix(c(73,0,61,12),2,2) --- she didn't give details and I didn't
pursue
this.) I pointed out to her that because of the dependence --- same 73
cats pre- and post- treatment --- the chi-squared test is
inappropriate.
So what *is* appropriate? There is a dependence structure of some
sort,
but it seems to me to be impossible to estimate.
After mulling it over for a long while (I'm slow!) I decided that a
non-parametric approach, along the following lines, makes sense:
We have 73 independent pairs of outcomes (a,b) where a or b is 0
if the cat didn't barf, and is 1 if it did barf.
We actually observe 61 (0,0) pairs and 12 (0,1) pairs.
If there is no effect from the piroxicam, then (0,1) and (1,0) are
equally likely. So given that the outcome is in {(0,1),(1,0)} the
probability of each is 1/2.
Thus we have a sequence of 12 (0,1)-s where (under the null
hypothesis)
the probability of each entry is 1/2. Hence the probability of this
sequence is (1/2)^12 = 0.00024. So the p-value of the (one-sided)
test
is 0.00024. Hence the result is ``significant'' at the usual levels,
and my vet friend is happy.
I would very much appreciate comments on my reasoning. Have I made
any
goof-ups, missed any obvious pit-falls? Gone down a wrong garden
path?
Is there a better approach?
Most importantly (!!!): Is there any literature in which this
approach is
spelled out? (The journal in which she wishes to publish will
almost surely
demand a citation. They *won't* want to see the reasoning spelled
out in
the paper.)
I would conjecture that this sort of scenario must arise reasonably
often
in medical statistics and the suggested approach (if it is indeed
valid
and sensible) would be ``standard''. It might even have a name!
But I
have no idea where to start looking, so I thought I'd ask this
wonderfully
learned list.
Thanks for any input.
cheers,
Rolf Turner
##
Attention:\ This e-mail message is privileged and confid...{{dropped:
9}}
__
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https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
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and provide commented, minimal, self-contained, reproducible code.
[R] ifelse()
I have a problem with ifelse(), I do not understand how it works. X-c(2,2,1,1,0,0) str(X) num [1:6] 2 2 1 1 0 0 Y-ifelse(X0,1,0) Y [1] 1 1 1 1 0 0 Can some one explain what is going on, I do not understand what ifelse is doing in this case. Can someone explain the output Y. Thanks -- View this message in context: http://www.nabble.com/ifelse%28%29-tp21943309p21943309.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] ifelse()
I have a problem with ifelse(), I do not understand how it works. X-c(2,2,1,1,0,0) str(X) num [1:6] 2 2 1 1 0 0 Y-ifelse(X0,1,0) Y [1] 1 1 1 1 0 0 Can some one explain what is going on, I do not understand what ifelse is doing in this case. Can someone explain the output Y. Thanks -- View this message in context: http://www.nabble.com/ifelse%28%29-tp21943308p21943308.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] tcltk, tcltk2, Rcmdr, Mac OS X
Dear Colleagues, When I try to install Rcmdr the following happens: -- library(Rcmdr) Error in structure(.External(dotTclObjv, objv, PACKAGE = tcltk), class = tclObj) : [tcl] invalid command name font. Error : .onAttach failed in 'attachNamespace' Error: package/namespace load failed for 'Rcmdr' -- I wondered if this is because there is no tcltk package installed. So I tried: -- install.packages(tcltk) Warning in install.packages(tcltk) : argument 'lib' is missing: using '/Users/hanser/Library/R/library' Warning message: package 'tcltk' is not available -- Is there in fact a tcltk package? Has it been replaced by tcltk2? Help appreciated. Regards, Larry [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] ifelse()
It is checking the series of values of X and returning a series of 1 and 0's; 1 if it meets your condition (X0) and 0 if it doesn't. What did you expect? A more complex invocation might look like this: ifelse( X 0, 1:3, -1:-2) [1] 1 2 3 1 -1 -2 Note the recycling of the elements of the yes and no arguments Consider also: (X0)+0 [1] 1 1 1 1 0 0 -- David Winsemius On Feb 10, 2009, at 4:44 PM, kayj wrote: I have a problem with ifelse(), I do not understand how it works. X-c(2,2,1,1,0,0) str(X) num [1:6] 2 2 1 1 0 0 Y-ifelse(X0,1,0) Y [1] 1 1 1 1 0 0 Can some one explain what is going on, I do not understand what ifelse is doing in this case. Can someone explain the output Y. Thanks -- View this message in context: http://www.nabble.com/ifelse%28%29-tp21943309p21943309.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] ifelse()
Hello, ifelse checks condition whether X (or, ina fact every value in X) is greater than 0. If it is 1 is assigned and if it isn't then 0. 2 and 1 are greater than 0, therefore the first four values of Y are 1. 0 isn't greater than 0, therefore the last two values of Y are 0. 2009/2/10 kayj kjaj...@yahoo.com I have a problem with ifelse(), I do not understand how it works. X-c(2,2,1,1,0,0) str(X) num [1:6] 2 2 1 1 0 0 Y-ifelse(X0,1,0) Y [1] 1 1 1 1 0 0 Can some one explain what is going on, I do not understand what ifelse is doing in this case. Can someone explain the output Y. Thanks -- View this message in context: http://www.nabble.com/ifelse%28%29-tp21943308p21943308.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.htmlhttp://www.r-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
