[R] Enquiry for applying Self-Organizing Map for Time Series Prediction in R

2013-09-03 Thread YoungrangKang
Dear Sir/Madam
 
Hi, my name is Youngrang Kang and I have started to study R for about a few 
months ago. I have used some Time Series Prediction (TSP) Models in R and I 
have found an interesting TSP Model, which is Self-Organizing Map(SOM) for TSP. 
I have read the articles on the R Package ¡®SOM¡¯ and ¡®kohonen¡¯. However, 
these articles were insufficient to apply SOM for TSP in R. Does anyone know 
how to apply SOM for TSP in R? or Does anyone has a sample source code that I 
can refer?
 
I am looking forward to hearing from you soon.
 
Regards,
Youngrang Kang
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[R] enquiry

2012-10-01 Thread Karan Anand
hi,
I am new to using R ,I have 2 datasets with dates common in them ,how
can i take out the common dates within them.

karan

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Re: [R] enquiry

2012-10-01 Thread R. Michael Weylandt
On Monday, October 1, 2012, Karan Anand wrote:

 hi,
 I am new to using R ,I have 2 datasets with dates common in them ,how
 can i take out the common dates within them.


Depending on what you mean by 'out' either merge() or setdiff()

RMW



 karan

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Re: [R] enquiry

2012-10-01 Thread Rui Barradas

Hello,

Or maybe %in%.

x - Sys.Date() + 1:10
y - Sys.Date() + 7:15

x %in% y # logical index into 'x'
x[x %in% y] # common
x[!x %in% y] # not common

setdiff(x, y) # doesn't keep class Date


Hope this helps,

Rui Barradas

Em 01-10-2012 15:57, R. Michael Weylandt escreveu:

On Monday, October 1, 2012, Karan Anand wrote:


hi,
 I am new to using R ,I have 2 datasets with dates common in them ,how
can i take out the common dates within them.



Depending on what you mean by 'out' either merge() or setdiff()

RMW




karan

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Re: [R] enquiry

2012-08-03 Thread Erdal Karaca
Yep, you are right, this works:

readCell - function(workbook, sheetName, i, j) {
pos - getSheetPos(workbook, sheetName)
readWorksheet(workbook, pos, startRow=i, endRow=i, startCol=j, endCol=j,
header=FALSE)[[1]]
}

2012/7/17 Rui Barradas ruipbarra...@sapo.pt

 Hello,

 Sorry, but I'm not at my computer and will be away from it for 2 or 3
 days, so I can't install package XLConnect and see what's going on.

 Heve you tried the functions to get sheets first? (by number, maybe.)

 Rui Barradas

 Em 16-07-2012 22:30, Erdal Karaca escreveu:

 Just tried XLConnect which seems to work without any problems...

 When defining this:

 wb - loadWorkbook(c:\\path-to-xls-file)

 readCell - function(sheet, row, col) {
   readWorksheet(wb, sheet, startRow=row, endRow=row, startCol=col,
 endCol=col, header=FALSE)[[1]]
 }

 then, calling the function like this:

 readCell(Tabelle1, 1, 1)

 I will get this error message: Fehler in startRow - 1 :
 nicht-numerisches Argument für binären Operator (error in startRow - 1:
 non-numeric argument for binary operator)

 What am I doing wrong?

 Note: I just want to read the value of a specific cell. The best way is
 to have a function providing an excel like coordinate (e.g. A1)...

 2012/7/16 Rui Barradas ruipbarra...@sapo.pt mailto:ruipbarra...@sapo.pt
 


 Sorry, it's

 findFn(xlsx)

 And the first three hits ARE promising (they work). I use the
 second, package xlsx. Package XLConnect is more flexible if you want
 to do things to excel spreadsheets from R. Package xlsx is simpler
 if you just want to read them and then use R.

 Rui Barradas

 Em 16-07-2012 07:37, Rui Barradas escreveu:

 Hello,

 Try the following.

 install.packages(sos)  # to install the package
 library(sos) # to load the package nto R session
 finFn(xlsx)# find it

 Have fun.

 Hope this helps,

 Rui Barradas

 Em 16-07-2012 06:17, Karan Anand escreveu:

 hi,
i am new to r ,i have a xlsx data with me with 12
 sheet in it  and
 need to convert it to csv  first and then need to  convert
 it into time
 series ,so if u can pls guide me a little how to do it.


 Regards
 karan

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 list

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 code.


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Re: [R] enquiry

2012-07-17 Thread Rui Barradas

Hello,

Sorry, but I'm not at my computer and will be away from it for 2 or 3 
days, so I can't install package XLConnect and see what's going on.


Heve you tried the functions to get sheets first? (by number, maybe.)

Rui Barradas

Em 16-07-2012 22:30, Erdal Karaca escreveu:

Just tried XLConnect which seems to work without any problems...

When defining this:

wb - loadWorkbook(c:\\path-to-xls-file)

readCell - function(sheet, row, col) {
  readWorksheet(wb, sheet, startRow=row, endRow=row, startCol=col,
endCol=col, header=FALSE)[[1]]
}

then, calling the function like this:

readCell(Tabelle1, 1, 1)

I will get this error message: Fehler in startRow - 1 :
nicht-numerisches Argument für binären Operator (error in startRow - 1:
non-numeric argument for binary operator)

What am I doing wrong?

Note: I just want to read the value of a specific cell. The best way is
to have a function providing an excel like coordinate (e.g. A1)...

2012/7/16 Rui Barradas ruipbarra...@sapo.pt mailto:ruipbarra...@sapo.pt

Sorry, it's

findFn(xlsx)

And the first three hits ARE promising (they work). I use the
second, package xlsx. Package XLConnect is more flexible if you want
to do things to excel spreadsheets from R. Package xlsx is simpler
if you just want to read them and then use R.

Rui Barradas

Em 16-07-2012 07:37, Rui Barradas escreveu:

Hello,

Try the following.

install.packages(sos)  # to install the package
library(sos) # to load the package nto R session
finFn(xlsx)# find it

Have fun.

Hope this helps,

Rui Barradas

Em 16-07-2012 06:17, Karan Anand escreveu:

hi,
   i am new to r ,i have a xlsx data with me with 12
sheet in it  and
need to convert it to csv  first and then need to  convert
it into time
series ,so if u can pls guide me a little how to do it.


Regards
karan

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Re: [R] enquiry

2012-07-16 Thread Rui Barradas

Hello,

Try the following.

install.packages(sos)  # to install the package
library(sos) # to load the package nto R session
finFn(xlsx)# find it

Have fun.

Hope this helps,

Rui Barradas

Em 16-07-2012 06:17, Karan Anand escreveu:

hi,
  i am new to r ,i have a xlsx data with me with 12 sheet in it  and
need to convert it to csv  first and then need to  convert it into time
series ,so if u can pls guide me a little how to do it.


Regards
karan

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and provide commented, minimal, self-contained, reproducible code.



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Re: [R] enquiry

2012-07-16 Thread Rui Barradas

Sorry, it's

findFn(xlsx)

And the first three hits ARE promising (they work). I use the second, 
package xlsx. Package XLConnect is more flexible if you want to do 
things to excel spreadsheets from R. Package xlsx is simpler if you just 
want to read them and then use R.


Rui Barradas

Em 16-07-2012 07:37, Rui Barradas escreveu:

Hello,

Try the following.

install.packages(sos)  # to install the package
library(sos) # to load the package nto R session
finFn(xlsx)# find it

Have fun.

Hope this helps,

Rui Barradas

Em 16-07-2012 06:17, Karan Anand escreveu:

hi,
  i am new to r ,i have a xlsx data with me with 12 sheet in it  and
need to convert it to csv  first and then need to  convert it into time
series ,so if u can pls guide me a little how to do it.


Regards
karan

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Re: [R] enquiry

2012-07-16 Thread Erdal Karaca
Just tried XLConnect which seems to work without any problems...

When defining this:

wb - loadWorkbook(c:\\path-to-xls-file)

readCell - function(sheet, row, col) {
 readWorksheet(wb, sheet, startRow=row, endRow=row, startCol=col,
endCol=col, header=FALSE)[[1]]
}

then, calling the function like this:

readCell(Tabelle1, 1, 1)

I will get this error message: Fehler in startRow - 1 : nicht-numerisches
Argument für binären Operator (error in startRow - 1: non-numeric argument
for binary operator)

What am I doing wrong?

Note: I just want to read the value of a specific cell. The best way is to
have a function providing an excel like coordinate (e.g. A1)...

2012/7/16 Rui Barradas ruipbarra...@sapo.pt

 Sorry, it's

 findFn(xlsx)

 And the first three hits ARE promising (they work). I use the second,
 package xlsx. Package XLConnect is more flexible if you want to do things
 to excel spreadsheets from R. Package xlsx is simpler if you just want to
 read them and then use R.

 Rui Barradas

 Em 16-07-2012 07:37, Rui Barradas escreveu:

  Hello,

 Try the following.

 install.packages(sos)  # to install the package
 library(sos) # to load the package nto R session
 finFn(xlsx)# find it

 Have fun.

 Hope this helps,

 Rui Barradas

 Em 16-07-2012 06:17, Karan Anand escreveu:

 hi,
   i am new to r ,i have a xlsx data with me with 12 sheet in it  and
 need to convert it to csv  first and then need to  convert it into time
 series ,so if u can pls guide me a little how to do it.


 Regards
 karan

 [[alternative HTML version deleted]]

 __
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[R] enquiry

2012-07-15 Thread Karan Anand
hi,
 i am new to r ,i have a xlsx data with me with 12 sheet in it  and
need to convert it to csv  first and then need to  convert it into time
series ,so if u can pls guide me a little how to do it.


Regards
karan

[[alternative HTML version deleted]]

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[R] enquiry

2012-07-02 Thread Karan Anand
hi,
i am new  to using r .so if you can pls  tell me how  to read 1951-52
,1952-52 date format in r

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Re: [R] enquiry

2012-07-02 Thread jim holtman
try this:

 as.Date('1951-52', format = %Y-%j)
[1] 1951-02-21



On Mon, Jul 2, 2012 at 5:44 AM, Karan Anand anand.kara...@gmail.com wrote:
 hi,
     i am new  to using r .so if you can pls  tell me how  to read 1951-52
 ,1952-52     date format in r

         [[alternative HTML version deleted]]

 __
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-- 
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.

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Re: [R] enquiry

2012-07-02 Thread jim holtman
In order to do any conversion, you have to know the format of the data
that is being input.  So which is it:  does 52 represent the day of
the year, or the week of the year?  Does make a big difference, but
until you know what 1952-52 means, it is hard to specify which way
you should do the conversion.

On Mon, Jul 2, 2012 at 9:12 AM, arun smartpink...@yahoo.com wrote:
 Hi Jim,

 I tried,

 dat2-as.Date(dat1,format=%Y-%V)
 dat2
 [1] 1951-07-02 1952-07-02

 But, if the format is for -wk or -yy, then, not sure how this will 
 help.

 A.K.




 - Original Message -
 From: jim holtman jholt...@gmail.com
 To: Karan Anand anand.kara...@gmail.com
 Cc: r-help@r-project.org
 Sent: Monday, July 2, 2012 9:04 AM
 Subject: Re: [R] enquiry

 try this:

 as.Date('1951-52', format = %Y-%j)
 [1] 1951-02-21



 On Mon, Jul 2, 2012 at 5:44 AM, Karan Anand anand.kara...@gmail.com wrote:
 hi,
     i am new  to using r .so if you can pls  tell me how  to read 1951-52
 ,1952-52     date format in r

         [[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.



 --
 Jim Holtman
 Data Munger Guru

 What is the problem that you are trying to solve?
 Tell me what you want to do, not how you want to do it.

 __
 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
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-- 
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.

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Re: [R] enquiry

2012-07-02 Thread arun
Hi Jim,

I tried,

dat2-as.Date(dat1,format=%Y-%V)
 dat2
[1] 1951-07-02 1952-07-02

But, if the format is for -wk or -yy, then, not sure how this will help.

A.K.




- Original Message -
From: jim holtman jholt...@gmail.com
To: Karan Anand anand.kara...@gmail.com
Cc: r-help@r-project.org
Sent: Monday, July 2, 2012 9:04 AM
Subject: Re: [R] enquiry

try this:

 as.Date('1951-52', format = %Y-%j)
[1] 1951-02-21



On Mon, Jul 2, 2012 at 5:44 AM, Karan Anand anand.kara...@gmail.com wrote:
 hi,
     i am new  to using r .so if you can pls  tell me how  to read 1951-52
 ,1952-52     date format in r

         [[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.



-- 
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.

__
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Re: [R] Enquiry about 2nd-order interactions survival analysis

2011-11-14 Thread Terry Therneau
David's answers were correct.  You are looking deep into the code when
there is no reason to to so.

1. h(t|(X=x,Z=z)) = exp(Beta0 + XZBeta1) 
Most statisticians will tell you that this is an unwise model.  The
reason is that if you replace X with X+1 the fit changes, which is
almost never desirable.  What if someone coded your dummy variable as
1/0 instead of 0/1 -- wouldn't you want to get the same fit
  Therefore the default in R for the model
 lm(y ~ x*z)
is to fit  y = b0 + b1 x + b2 z + b3 xz

   You can get exactly the model you specify as lm(y ~ x:z), or as
 temp - x*z; lm(y ~ temp) 
Statistically, this is almost surely a mistake.

2. The model formulas work across packages.  I used lm() above, but
survreg is no different.  Formula processing is done by the
model.matrix() function, which survreg, lm, glm,   all call.  My C
code is all downstream of this, and irrelevant to your question.

Terry T

On Sun, 2011-11-13 at 14:39 +0800, Kenji Ryusuke wrote:
 Dr Terry Therneau,
 
 Firstly I do apologize upon unsolicited email. I know about Dr Terry
 through R package survival and alot of your papers.
 
 As we know Equation(1) is a normal parametric survival analysis, I'ld
 like to modify it to be a 2nd-order interactions as in Equation(2) :- 
 h(t|X=x)  = exp(Beta0 + XBeta1)  --- (1)
 h(t|(X=x,Z=z)) = exp(Beta0 + XZBeta1) -- (2)
 
 Where x and z are two covariates: 
 x = dummy variable (1 or 0) 
 z = factors (people name)
 
 I would like to modify survreg() to be a second-order interactions
 regression while there is no 2nd-order interactions survival
 regression as I searched over www.rseek.org. I tried to read through
 the codes of survreg(), but I am stuck (cannot understand) at
 survreg6.c 
 
 survreg6.c apply C Language which involves Cholesky decomposition
 multi-matrix (first-order interactions) calculation. 
 1) chinv2.c 
 2) cholesky3.c 
 3) chsolve2.c (only solve the equations of first-order interactions) 
 
 I do appreciate if Dr Terry willing to enlighten me.
 Thank you. 
 
 
 Best, 
 Ryusuke

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[R] Enquiry on Vrtest

2011-05-28 Thread Chim Kaho
Hi there,

I am currently working on my dissertation which is about testing the
martingale hypothesis in the stock market using a methodology involving a
range of variance ratio tests and multiple variance ratio tests. I contacted
the author of a reference paper and I was told that the tests can be
conducted using R programming language. Although I have gone through the
theoretical background of the methodology, but I found it quite difficult to
implement the tests practically using my own data. As I have little
experience in R.

I would be really appreciated if you could do me a favour by giving me some
hints on to use the Reference Manual written by the author of Vrtest, is it
correct for me to read in my own data, and then type in the codes from the
reference manual to get results.Obviously, I have installed the Vrtest
package. I tried to type in the command from the reference manual and they
always return Error: could not find function, I would like to know how to
solve this. Many thanks.

-- 
Best regards


River Jim

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Re: [R] Enquiry on Vrtest

2011-05-28 Thread David Winsemius


On May 28, 2011, at 10:58 AM, Chim Kaho wrote:


Hi there,

I am currently working on my dissertation which is about testing the
martingale hypothesis in the stock market using a methodology  
involving a
range of variance ratio tests and multiple variance ratio tests. I  
contacted

the author of a reference paper and I was told that the tests can be
conducted using R programming language. Although I have gone through  
the
theoretical background of the methodology, but I found it quite  
difficult to

implement the tests practically using my own data. As I have little
experience in R.

I would be really appreciated if you could do me a favour by giving  
me some
hints on to use the Reference Manual written by the author of  
Vrtest, is it
correct for me to read in my own data, and then type in the codes  
from the

reference manual to get results.Obviously, I have installed the Vrtest
package. I tried to type in the command from the reference manual  
and they
always return Error: could not find function, I would like to know  
how to

solve this. Many thanks.



A fairly common beginner mistake is to install a package but then not  
not understand that thye also need to laod it.


?require
?library

--
David Winsemius, MD
West Hartford, CT

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[R] enquiry

2007-09-12 Thread ah06981
Dear R-help,

I am trying to estimate a Cox model with nested effects basing on the 
minimization of the overall AIC; I have two frailties terms, both gamma 
distributed.  There is a error message (theta2 argument  misses) and I 
don?t understand why. I would like to know what I have wrong. Thank you 
very much for your time.


fitM7 - coxph(Surv(lifespan,censured) ~ south + frailty(id, 
dist='gamma')+ frailty(mob, dist='gamma'), data= usa)


tempfun - function(theta1, theta2) {

fit - coxph(Surv(lifespan,censured) ~ south + frailty(id, 
dist='gamma', sparse= TRUE, theta=theta1)+ frailty(mob, dist='gamma', 
sparse =TRUE, theta=theta2), data=usa)
aic - (fit$loglik[2] - fit$loglik[1]) - sum(fit$df)
return(2*aic)
}
nlminb(c(theta1=3.2,theta2=.2), tempfun)




Error in (get(temp))(x, ...) : argument theta2 is missing, with no default

Best,
Silvia

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