[R] robust correlation in R

2004-06-09 Thread Xavier . Abulker




Dear R user group,

I'm looking for a robust mesure of correlation in R.
I found a very interesting article by Dr Rich Herrington on
http://www.unt.edu/benchmarks/archives/2001/december01/rss.htm and I'd like
to implement
exaclty this method but my problem is that everything is here developped in
R language and is very slow when the correlation matrix is important.
I'm wondering if someone has maybe developped the same (or equivalent)
method using  functions in C like it is currently developped in r for the
covariance and variance.
Thank you for your help.

Xavier


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[R] robust correlation in R

2004-06-09 Thread Xavier . Abulker





Dear R user group,

I'm looking for a robust mesure of correlation in R.
I found a very interesting article by Dr Rich Herrington on
http://www.unt.edu/benchmarks/archives/2001/december01/rss.htm and I'd like
to implement
exaclty this method but my problem is that everything is here developped in
R language and is very slow when the correlation matrix is important.
I'm wondering if someone has maybe developped the same (or equivalent)
method using  functions in C like it is currently developped in r for the
covariance and variance.
Thank you for your help.

Xavier



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Re: [R] writing complex outputs to table

2007-09-10 Thread Xavier Abulker

Steve,
This example works:

x-TukeyHSD(fm1, tension, ordered = TRUE)
as.table(x$tension)


Steve Powers wrote:
 
 So I've come across a few cases where complex outputs from functions 
 will not write to tables. The most recent case involves the TukeyHSD 
 function in the stats package. If I save the TukeyHSD call and print it, 
 that obviously goes fine, but when I try writing to a table, I get an 
 error message that says cannot coerce class \multicomp\ into 
 dataframe. What does this mean, and how do I work around it? Is there a 
 more fail-safe general method of writing complex outputs to a table? 
 The story here is I want to be able to call certain values from the 
 TukeyHSD results to produce custom summaries.
 
 Using R version 2.4 on Windows XP.---steve
 
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Re: [R] write.csv / string extraction and field limits

2007-09-10 Thread Xavier Abulker

This example works fine:

test-matrix(c(1,2,'VOICIUNPETITTES',3),ncol=2,nrow=2)
write.csv(test,file='C:/xavier/test.csv')


Could you provide the same small example when it doesn't work?



kwaj wrote:
 
 Hello, 
 
 I have a peculiar problem which I am hoping I can get help on. 
 
 I am using the write.csv command to write a matrix structure to a file,
 which I later read in excel. The command works quite well for most strings
 and numerical values in the matrix structure. 
 
 However, I have found that when a field in the matrix contains a string of
 long length, when the matrix is finally written the file - the field shows
 up as NA. I am assuming write.csv has a limit on the field size? Maybe
 16 characters?
 
 Assuming the above is correct - I tried to extract a portion of the string
 using the 'substring' command and enter the extracted portion into the
 field before using the write.csv command. However I find, that when a
 string is extracted, the output from write.csv generates a NA in the file
 output. 
 
 My questions are:
 
 1) Does write.csv have a limit on the size of strings in the matrix
 fields? Is there anyway to place large strings in the field?
 
 2) Is there anyway to make the substring command or an alternative but
 similar command, compatible with write.csv? I have tried
 'as.character(substring(phrase, min, max)' and that does not seem to work
 
 cheers
 
 
 

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