Re: [R] Question on Differentiating Two Populations in R
If I am understanding correctly you can have a look at ? t.test and ? wilcox.test depending on assumptions. Jim - Original Message - From: James R. Graham [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Saturday, August 07, 2004 9:38 PM Subject: [R] Question on Differentiating Two Populations in R Hello All, Forgive me if this a blatantly newbie question or not germane to the list, but i was wondering if my current approach to my problem is the best way in R. I have two experimental datasets (positive and negative) of differing lengths and a large number of ways of numerically expressing the data by using various scales to represent each data point. I am looking for a scale that will allow me to differentiate between the positive and negative populations. Each dataset is simply a list of numbers: 43 numbers in the positive case and 9 in the negative (small sets, i know, but it's all the data i currently have) and I have hundreds of scales. I assign each dataset to a variable using scan() (each are in separate files). My initial comparison of the two datasets is simply a boxplot with the hope that the two do not overlap too much... Is this the way you would approach this problem? Is there an easier way of doing this in R? Any and all help is greatly appreciated! james __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] Forcing Sweave text to fit
List I am preparing a document in Sweave where I would like the R output on the file. So I have used echo=T= text @ In some cases, I have text that is very long. Consequently, the tex file has my text going way out into the margins and the document looks a little sloppy. Is there a way to force the text to wrap around instead of going out into the margins? Thanks, Harold [[alternative HTML version deleted]] __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] Forcing Sweave text to fit
On Sunday 08 August 2004 11:24, Doran, Harold wrote: List I am preparing a document in Sweave where I would like the R output on the file. So I have used echo=T= text @ In some cases, I have text that is very long. Consequently, the tex file has my text going way out into the margins and the document looks a little sloppy. Is there a way to force the text to wrap around instead of going out into the margins? AFAIR, you want to set options(width = 40) or something similar in a (preferably non-echoed) 'initialization' chunk at the top of your document. Deepayan __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] R packages install problems linux - X not found (WhiteBox EL 3)
Good evening everyone, I am used to using R under Windows, but have done an install of 1.9.1 under WhiteBox linux 3 (based on RHEL 3). This all went without a hitch, along with most of the additional package installs. However, while trying to install car and rgl I hit a problem regarding the X environment not being found. As I was doing the install from a console *within* the X environment, this is obviously down to a missing environment variable or link. The X11 directories all seem to be in the usual places. I've checked as much as I can through the archives and googled around, but to no avail. Any help appreciated. Thanks for taking the time to read this. Regards M [[alternative HTML version deleted]] __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] vectorized lines
Hi, I thought that the following code would give me a set of parallel lines on a plot as in the second example. q-c(-2253,-2119,-1985,-1850) p-c(1,2,3,4) a-rep(min(p),4) b-rep(max(p),4) plot(p,q) # example 1 lines(c(a,b),c(q,q)) Now this gives me the lines I really want: # example 2 lines(c(a[1],b[1]),c(q[1],q[1])) lines(c(a[2],b[2]),c(q[2],q[2])) lines(c(a[3],b[3]),c(q[3],q[3])) lines(c(a[4],b[4]),c(q[4],q[4])) I assumed that example 1 was a shorter (vectorized) way of writing example 2?? What have I got wrong? cheers, Mikkel __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] vectorized lines
Mikkel Grum wrote: Hi, I thought that the following code would give me a set of parallel lines on a plot as in the second example. q-c(-2253,-2119,-1985,-1850) p-c(1,2,3,4) a-rep(min(p),4) b-rep(max(p),4) plot(p,q) # example 1 lines(c(a,b),c(q,q)) Now this gives me the lines I really want: # example 2 lines(c(a[1],b[1]),c(q[1],q[1])) lines(c(a[2],b[2]),c(q[2],q[2])) lines(c(a[3],b[3]),c(q[3],q[3])) lines(c(a[4],b[4]),c(q[4],q[4])) I assumed that example 1 was a shorter (vectorized) way of writing example 2?? What have I got wrong? See ?segments Uwe Ligges cheers, Mikkel __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] R packages install problems linux - X not found (WhiteBox EL 3)
On Sun, 2004-08-08 at 12:32, Douglas Bates wrote: Dr Mike Waters wrote: I am used to using R under Windows, but have done an install of 1.9.1 under WhiteBox linux 3 (based on RHEL 3). This all went without a hitch, along with most of the additional package installs. However, while trying to install car and rgl I hit a problem regarding the X environment not being found. As I was doing the install from a console *within* the X environment, this is obviously down to a missing environment variable or link. The X11 directories all seem to be in the usual places. I've checked as much as I can through the archives and googled around, but to no avail. Any help appreciated. Or a missing development package. In many Linux distributions the include files for X11 are in a separate package from the run-time libraries. I have never used WhiteBox Linux but I imagine that will be the case for that distribution too. Check to see if there is a package with a name like xlibs-dev or x-dev. Just to amplify on Doug's comments, the RPM in question should be something like: XFree86-devel-... where the ... is replaced the by version numbering schema. I am presuming that WhiteBox has not yet changed over to the use of X.org in place of XFree86 at this point. If it has, then the RPM would be something like: xorg-x11-devel-... An easy way to check for this would be to open a console window and use: rpm -q XFree86-devel in the first case or: rpm -q xorg-x11-devel in the second case. If nothing is returned by the command, then it would confirm that you are missing the requisite RPM. In the case of the RGL package, you might want to review this recent thread: https://www.stat.math.ethz.ch/pipermail/r-help/2004-August/thread.html which indicates some issues related to the same devel libraries, including the XFree86-Mesa-libGL (or xorg-x11-Mesa-libGL) and XFree86-Mesa-libGLU (or xorg-x11-Mesa-libGLU) RPMS. HTH, Marc Schwartz __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] R packages install problems linux - X not found (WhiteBox EL 3)
On Sun, 2004-08-08 at 12:53, Marc Schwartz wrote: In the case of the RGL package, you might want to review this recent thread: https://www.stat.math.ethz.ch/pipermail/r-help/2004-August/thread.html Correction on the above URL. I pasted the wrong one here. It should be: https://www.stat.math.ethz.ch/pipermail/r-help/2004-August/053994.html Marc __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] vectorized lines
abline(h=q) might be useful Jim - Original Message - From: Mikkel Grum [EMAIL PROTECTED] To: RHelp [EMAIL PROTECTED] Sent: Sunday, August 08, 2004 1:26 PM Subject: [R] vectorized lines Hi, I thought that the following code would give me a set of parallel lines on a plot as in the second example. q-c(-2253,-2119,-1985,-1850) p-c(1,2,3,4) a-rep(min(p),4) b-rep(max(p),4) plot(p,q) # example 1 lines(c(a,b),c(q,q)) Now this gives me the lines I really want: # example 2 lines(c(a[1],b[1]),c(q[1],q[1])) lines(c(a[2],b[2]),c(q[2],q[2])) lines(c(a[3],b[3]),c(q[3],q[3])) lines(c(a[4],b[4]),c(q[4],q[4])) I assumed that example 1 was a shorter (vectorized) way of writing example 2?? What have I got wrong? cheers, Mikkel __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] manipulating strings
Hi I have a called fil consisting of the following strings. fil [1] 102.2 639104.2 224105.1 1159 107.1 1148 108.1 1376 [6] 109.2 1092 111.2 1238 112.2 349113.1 1204 114.1 537 [11] 115.0 303116.1 490117.2 202118.1 1864 119.0 357 I want to get a data frame like TimeObs 102.2 639 104.2 224 105.1 1159 107.1 1148 108.1 1376 109.2 1092 111.2 1238 112.2 349 113.1 1204 114.1 537 etc Can anyone see an efficient way of doing this? Thanks. Stephen __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
FW: [R] R packages install problems linux - X not found (WhiteBoxEL 3)
-Original Message- From: Dr Mike Waters [mailto:[EMAIL PROTECTED] Sent: 08 August 2004 20:11 To: '[EMAIL PROTECTED]' Subject: RE: [R] R packages install problems linux - X not found (WhiteBoxEL 3) -Original Message- Correction on the above URL. I pasted the wrong one here. It should be: https://www.stat.math.ethz.ch/pipermail/r-help/2004-August/053994.html Marc Thanks for the responses guys. I used to have RH9 installed on this machine and I found out about the separate developer packages then. I thought that I had got the relevant XFree devel package installed, but although it showed up in the rpm database as being present, the required files were not present. I did a forced rpm upgrade from the WhiteBox updates directory and that problem is now fixed, at least for car. Marc, thanks for the pointer on the rgl problem. However, I have a slightly different problem with the install of this package. It gets through to the point where it tries to make the rgl.so from the various .o files and fails then, as follows: g++ -I/usr/lib/R/include -I/usr/X11R6/include -DHAVE_PNG_H -I/usr/include -I/usr/local/include -Wall -pedantic -fno-exceptions -fno-rtti -fPIC -O2 -g -march=i386 -mcpu=i686 -c glgui.cpp -o glgui.o g++ -L/usr/local/lib -o rgl.so x11lib.o x11gui.o types.o math.o fps.o pixmap.o gui.o api.o device.o devicemanager.o rglview.o scene.o glgui.o -L/usr/X11R6/lib -L/usr/lib -lstdc++ -lX11 -lXext -lGL -lGLU -lpng /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/../../../crt1.o(.text+0x18): In function `_start': : undefined reference to `main' x11lib.o(.text+0x84): In function `set_R_handler': /tmp/R.INSTALL.13414/rgl/src/x11gui.h:33: undefined reference to `R_InputHandlers' x11lib.o(.text+0x92):/tmp/R.INSTALL.13414/rgl/src/x11gui.h:33: undefined reference to `addInputHandler' x11lib.o(.text+0xfb): In function `unset_R_handler': /tmp/R.INSTALL.13414/rgl/src/x11lib.cpp:52: undefined reference to `R_InputHandlers' x11lib.o(.text+0x103):/tmp/R.INSTALL.13414/rgl/src/x11lib.cpp:52: undefined reference to `removeInputHandler' collect2: ld returned 1 exit status make: *** [rgl.so] Error 1 ERROR: compilation failed for package 'rgl' ** Removing '/usr/lib/R/library/rgl' - No doubt another failed dependency... DOH! Regards M __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] manipulating strings
On Sun, 2004-08-08 at 13:58, Stephen Nyangoma wrote: Hi I have a called fil consisting of the following strings. fil [1] 102.2 639104.2 224105.1 1159 107.1 1148 108.1 1376 [6] 109.2 1092 111.2 1238 112.2 349113.1 1204 114.1 537 [11] 115.0 303116.1 490117.2 202118.1 1864 119.0 357 I want to get a data frame like TimeObs 102.2 639 104.2 224 105.1 1159 107.1 1148 108.1 1376 109.2 1092 111.2 1238 112.2 349 113.1 1204 114.1 537 etc Can anyone see an efficient way of doing this? Thanks. Stephen Try this: # Create strings MyStrings - c( 102.2 639, 104.2 224, 105.1 1159, 107.1 1148, 108.1 1376, 109.2 1092, 111.2 1238, 112.2 349, 113.1 1204, 114.1 537, 115.0 303, 116.1 490, 117.2 202, 118.1 1864, 119.0 357) MyStrings [1] 102.2 639 104.2 224 105.1 1159 107.1 1148 [5] 108.1 1376 109.2 1092 111.2 1238 112.2 349 [9] 113.1 1204 114.1 537 115.0 303 116.1 490 [13] 117.2 202 118.1 1864 119.0 357 # Now convert to a data frame, by first using strsplit(), to break up # each of the vector elements into three components, using as a # split character. This returns a list, which we then convert to vector, # using unlist(). Then use matrix() to convert the vector into a two # dimensional object with 3 cols. Use 'byrow = TRUE' so that we fill # the matrix row by row. Then take only the second and third columns # from the matrix and convert them into a data frame. df - as.data.frame(matrix(unlist(strsplit(MyStrings, split = )), ncol = 3, byrow = TRUE)[, 2:3]) # Finally, set the colnames colnames(df) - c(Time, Obs) df Time Obs 1 102.2 639 2 104.2 224 3 105.1 1159 4 107.1 1148 5 108.1 1376 6 109.2 1092 7 111.2 1238 8 112.2 349 9 113.1 1204 10 114.1 537 11 115.0 303 12 116.1 490 13 117.2 202 14 118.1 1864 15 119.0 357 Note that the above presumes that your strings (character vectors) have a leading in them and the Time and Obs elements are also separated by a in each. See ?strsplit for more information. HTH, Marc Schwartz __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
RE: [R] R packages install problems linux - X not found (WhiteBoxEL 3)
On Sun, 2004-08-08 at 14:10, Dr Mike Waters wrote: snip Thanks for the responses guys. I used to have RH9 installed on this machine and I found out about the separate developer packages then. I thought that I had got the relevant XFree devel package installed, but although it showed up in the rpm database as being present, the required files were not present. I did a forced rpm upgrade from the WhiteBox updates directory and that problem is now fixed, at least for car. Marc, thanks for the pointer on the rgl problem. However, I have a slightly different problem with the install of this package. It gets through to the point where it tries to make the rgl.so from the various .o files and fails then, as follows: g++ -I/usr/lib/R/include -I/usr/X11R6/include -DHAVE_PNG_H -I/usr/include -I/usr/local/include -Wall -pedantic -fno-exceptions -fno-rtti -fPIC -O2 -g -march=i386 -mcpu=i686 -c glgui.cpp -o glgui.o g++ -L/usr/local/lib -o rgl.so x11lib.o x11gui.o types.o math.o fps.o pixmap.o gui.o api.o device.o devicemanager.o rglview.o scene.o glgui.o -L/usr/X11R6/lib -L/usr/lib -lstdc++ -lX11 -lXext -lGL -lGLU -lpng /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/../../../crt1.o(.text+0x18): In function `_start': : undefined reference to `main' x11lib.o(.text+0x84): In function `set_R_handler': /tmp/R.INSTALL.13414/rgl/src/x11gui.h:33: undefined reference to `R_InputHandlers' x11lib.o(.text+0x92):/tmp/R.INSTALL.13414/rgl/src/x11gui.h:33: undefined reference to `addInputHandler' x11lib.o(.text+0xfb): In function `unset_R_handler': /tmp/R.INSTALL.13414/rgl/src/x11lib.cpp:52: undefined reference to `R_InputHandlers' x11lib.o(.text+0x103):/tmp/R.INSTALL.13414/rgl/src/x11lib.cpp:52: undefined reference to `removeInputHandler' collect2: ld returned 1 exit status make: *** [rgl.so] Error 1 ERROR: compilation failed for package 'rgl' ** Removing '/usr/lib/R/library/rgl' - No doubt another failed dependency... DOH! Regards I am concerned by your indications of previously having had RH9 on the same box and that you had to force an update of the XFree Devel RPM. Forcing the installation of an RPM is almost always a bad thing. When you installed WB on the system, did you do a clean installation or some type of upgrade? If the latter, it is reasonable to consider that there may be some level of mixing and matching of RPMS from the two distributions going on. This could result in a level of marginally or wholly incompatible versions of RPMS being installed. Could you clarify that point? Also, be sure that you have the same versions of the XFree series RPMS installed. Use: rpm -qa | grep XFree in a console and be sure that the RPMS return the same version schema. If not, it is possible that one of your problems is the mixing of versions. Take note of the output of the above and be sure that the XFree86-Mesa-libGL and XFree86-Mesa-libGLU RPMS are installed as well. Some of the messages above would also suggest a problem finding R related headers. How did you install R? This may be a red herring of sorts, given the other problems, but may be helpful. Marc __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] manipulating strings
Stephen Nyangoma S.Nyangoma at cs.rug.nl writes: : : Hi : I have a called fil consisting of the following strings. : : fil : [1] 102.2 639104.2 224105.1 1159 107.1 1148 :108.1 1376 : [6] 109.2 1092 111.2 1238 112.2 349113.1 1204 :114.1 537 : [11] 115.0 303116.1 490117.2 202118.1 1864 :119.0 357 : : I want to get a data frame like : : TimeObs : 102.2 639 : 104.2 224 : 105.1 1159 : 107.1 1148 : 108.1 1376 : 109.2 1092 : 111.2 1238 : 112.2 349 : 113.1 1204 : 114.1 537 : etc : : Can anyone see an efficient way of doing this? textConnection can be used to allow read.table to read them as if it were reading from a file: read.table(textConnection(fil), col.names = c(Time, Obs)) __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
RE: [R] R packages install problems linux - X not found (WhiteBoxEL 3)
On Sun, 8 Aug 2004, Marc Schwartz wrote: On Sun, 2004-08-08 at 14:10, Dr Mike Waters wrote: snip Thanks for the responses guys. I used to have RH9 installed on this machine and I found out about the separate developer packages then. I thought that I had got the relevant XFree devel package installed, but although it showed up in the rpm database as being present, the required files were not present. I did a forced rpm upgrade from the WhiteBox updates directory and that problem is now fixed, at least for car. Marc, thanks for the pointer on the rgl problem. However, I have a slightly different problem with the install of this package. It gets through to the point where it tries to make the rgl.so from the various .o files and fails then, as follows: g++ -I/usr/lib/R/include -I/usr/X11R6/include -DHAVE_PNG_H -I/usr/include -I/usr/local/include -Wall -pedantic -fno-exceptions -fno-rtti -fPIC -O2 -g -march=i386 -mcpu=i686 -c glgui.cpp -o glgui.o g++ -L/usr/local/lib -o rgl.so x11lib.o x11gui.o types.o math.o fps.o pixmap.o gui.o api.o device.o devicemanager.o rglview.o scene.o glgui.o -L/usr/X11R6/lib -L/usr/lib -lstdc++ -lX11 -lXext -lGL -lGLU -lpng /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/../../../crt1.o(.text+0x18): In function `_start': : undefined reference to `main' x11lib.o(.text+0x84): In function `set_R_handler': /tmp/R.INSTALL.13414/rgl/src/x11gui.h:33: undefined reference to `R_InputHandlers' x11lib.o(.text+0x92):/tmp/R.INSTALL.13414/rgl/src/x11gui.h:33: undefined reference to `addInputHandler' x11lib.o(.text+0xfb): In function `unset_R_handler': /tmp/R.INSTALL.13414/rgl/src/x11lib.cpp:52: undefined reference to `R_InputHandlers' x11lib.o(.text+0x103):/tmp/R.INSTALL.13414/rgl/src/x11lib.cpp:52: undefined reference to `removeInputHandler' collect2: ld returned 1 exit status make: *** [rgl.so] Error 1 ERROR: compilation failed for package 'rgl' ** Removing '/usr/lib/R/library/rgl' - No doubt another failed dependency... DOH! Regards I am concerned by your indications of previously having had RH9 on the same box and that you had to force an update of the XFree Devel RPM. Forcing the installation of an RPM is almost always a bad thing. When you installed WB on the system, did you do a clean installation or some type of upgrade? If the latter, it is reasonable to consider that there may be some level of mixing and matching of RPMS from the two distributions going on. This could result in a level of marginally or wholly incompatible versions of RPMS being installed. Could you clarify that point? Also, be sure that you have the same versions of the XFree series RPMS installed. Use: rpm -qa | grep XFree in a console and be sure that the RPMS return the same version schema. If not, it is possible that one of your problems is the mixing of versions. Take note of the output of the above and be sure that the XFree86-Mesa-libGL and XFree86-Mesa-libGLU RPMS are installed as well. Some of the messages above would also suggest a problem finding R related headers. How did you install R? This may be a red herring of sorts, given the other problems, but may be helpful. I think it is the exact point. Those entry points are in R.bin, so should be missing. The g++ line is missing `-shared', which is picked up from R_HOME/etc/Makeconf, specifically from SHLIB_CXXLDFLAGS = -shared So the R installation doesn't have the right flags. -- Brian D. Ripley, [EMAIL PROTECTED] 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 __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] (REPOST) Simple main effects in 2-way repeated measure ANOVA
Hi all I am running a 2-way repeated measure anova with 1 between-subjects factor (Group=treatment, control), and 1 within-subject factor (Time of measurement: time1, time2). I extract the results of the anova with: summary(aov(effect ~ Group*Time + Error=Subj/Time, data=mydata)) Now, this must be clearly a dumb question, but how can I quickly extract in R all the post-hoc t-tests for the simple main effects? Also, while I am at it, how do I enter in the model a counfounding covariate (e.g., Age)? And on a different matter, is there a way to receive interactive user input in an R script? Something like Enter the name of the factor: , or even more simply Press Enter to see the result of the next analysis thanks in advance for any suggestions! giuseppe Giuseppe Pagnoni Dept. Psychiatry and Behavioral Sciences Emory University 1639 Pierce Drive, Suite 4000 Atlanta, GA, 30322 tel: 404.712.8431 fax: 404.727.3233 __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] (REPOST) Simple main effects in 2-way repeated measure ANOVA
Why has this been REPOSTed? It was delivered last Thursday. On Sun, 8 Aug 2004, Giuseppe Pagnoni wrote: I am running a 2-way repeated measure anova with 1 between-subjects factor (Group=treatment, control), and 1 within-subject factor (Time of measurement: time1, time2). I extract the results of the anova with: summary(aov(effect ~ Group*Time + Error=Subj/Time, data=mydata)) That's not valid syntax for an R formula. Did you mean Error(Subj/Time)? Now, this must be clearly a dumb question, but how can I quickly extract in R all the post-hoc t-tests for the simple main effects? I very much hope you cannot, as you have specified an interaction, and you should not want t-tests for main effects in the presence of an interaction, and certainly not with the default R coding. Did you mean Group + Time? Also, while I am at it, how do I enter in the model a counfounding covariate (e.g., Age)? And on a different matter, is there a way to receive interactive user input in an R script? Something like Enter the name of the factor: , or even more simply Press Enter to see the result of the next analysis ?readline, or cat + scan or ... using connections. -- Brian D. Ripley, [EMAIL PROTECTED] 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 __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] Time zones
I am analysing some data collected over a number of months from Allentown, PA, which is just north of Philadelphia. I am using as.POSIXct for dates and times, and I need to get the timezone specification correct. Going on the documentation for DateTimeClasses, I believe one way to specify the correct time zone is tz=EST5EDT I would be grateful for any advice on this. I ask because I haven't been able to find a list of all the possible time zones or formats that can be used. I have done a bit of googling without to much success. I have read Gabor's article in the recent R Newsletter too. David Scott _ David Scott Department of Statistics, Tamaki Campus The University of Auckland, PB 92019 AucklandNEW ZEALAND Phone: +64 9 373 7599 ext 86830 Fax: +64 9 373 7000 Email: [EMAIL PROTECTED] Graduate Officer, Department of Statistics __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] returns the value of a polynomial of degree n evaluated at x.
Background: OS: Linux Mandrake 9.1 release: R 1.9.0 editor: Xemacs 21.4 frontend: ESS 5.1.23 - Colleagues Is there a function in R that is similar to polyval in matlab? (y = polyval(p,x) returns the value of a polynomial of degree n evaluated at x. The input argument p is a vector of length n+1 whose elements are the coefficients in descending powers of the polynomial to be evaluated). http://www.mathworks.com/access/helpdesk/help/techdoc/ref/polyval.html I have possibly missed it in the R help files, so please excuse me if I have. Polynomial evaluation yielded no result in a search of help, and the functions poly() and locpoly() don't seem to be what I am after. Sam Sam McClatchie, Sub-program leader, Pelagic Fisheries South Australian Aquatic Sciences Centre PO Box 120, Henley Beach 5022 Adelaide, South Australia email [EMAIL PROTECTED] Telephone: (61-8) 8200 2448 FAX: (61-8) 8200 2481 Research home page http://www.smcc.150m.com/ /\ ...xX(° °)Xx / \\ (((° (((° ...xX(°O°)Xx __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
RE: [R] returns the value of a polynomial of degree n evaluated a t x.
Try something like: install.packages(polynom) library(polynom) predict(polynomial(rev(p)), x) HTH, Andy From: McClatchie, Sam (PIRSA-SARDI) Background: OS: Linux Mandrake 9.1 release: R 1.9.0 editor: Xemacs 21.4 frontend: ESS 5.1.23 - Colleagues Is there a function in R that is similar to polyval in matlab? (y = polyval(p,x) returns the value of a polynomial of degree n evaluated at x. The input argument p is a vector of length n+1 whose elements are the coefficients in descending powers of the polynomial to be evaluated). http://www.mathworks.com/access/helpdesk/help/techdoc/ref/pol yval.html I have possibly missed it in the R help files, so please excuse me if I have. Polynomial evaluation yielded no result in a search of help, and the functions poly() and locpoly() don't seem to be what I am after. Sam Sam McClatchie, Sub-program leader, Pelagic Fisheries South Australian Aquatic Sciences Centre PO Box 120, Henley Beach 5022 Adelaide, South Australia email [EMAIL PROTECTED] Telephone: (61-8) 8200 2448 FAX: (61-8) 8200 2481 Research home page http://www.smcc.150m.com/ /\ ...xX(° °)Xx / \\ (((° (((° ...xX(°O°)Xx __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
