[R] Help to find correlation. Oops

[Frank E Harrell Jr]

Or simply

library(Hmisc)
rcorr(data matrix)

Frank

Martin Henry H. Stevens wrote:
> Hi,
> Ignore the previous post-it contained a typo. Sorry! The following is  
> ok.
> Hank
> 
> See help files for read.csv for input.
> See help files for cor.test
> dat <- read.csv("whatever-your-file-is", other info...)
> 
> # Generate an upper triangular  matrix of Pearson product moment  
> correlation coefficients
> r.s <- matrix(NA, nr=dim(dat)[2], nc=dim(dat)[2])
> rownames(r.s) <- names(dat)
> colnames(r.s) <- names(dat)
> for(i in 1:(dim(dat)[2]-1)) {
>    for(j in i:dim(dat)[2]) r.s[i,j] <- {cor.test(dat[,i], dat[,j]) 
> $estimate}}
> r.s
> 
> # Generate an upper triangular  matrix of P values of the r's
> p.s <- matrix(NA, nr=dim(dat)[2], nc=dim(dat)[2])
> rownames(p.s) <- names(dat)
> colnames(p.s) <- names(dat)
> for(i in 1:(dim(dat)[2]-1)) {
>    for(j in i:dim(dat)[2]) p.s[i,j] <- {cor.test(dat[,i], dat[,j]) 
> $p.value}}
> p.s
> 
> Please do read the help files.
> Hank
> 
> On Feb 16, 2006, at 1:17 PM, Anusha Aiyaloo kannan ((RIT Student))  
> wrote:
> 
> 
>>Respected Sir,
>>
>>I am trying to import excel file into R, but I need to truncate  
>>some columns from the original file.
>>
>> How to delete unwanted columns when I import data from excel file.
>>
>>How to use cor.test for the data when I want the output rowwise.
>>
>>How to do grouping and use cor.test on that data
>>
>>I need some help regarding how to calculate the correlation.
>>I don't know whether you understood my question, but I need help.
>>
>>Any help is appreciated.
>>
>>Thanks,
>>
>>
>>
>>	[[alternative HTML version deleted]]
>>
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> 
> 
> Dr. Martin Henry H. Stevens, Assistant Professor
> 338 Pearson Hall
> Botany Department
> Miami University
> Oxford, OH 45056
> 
> Office: (513) 529-4206
> Lab: (513) 529-4262
> FAX: (513) 529-4243
> http://www.cas.muohio.edu/~stevenmh/
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> http://www.muohio.edu/botany/
> "E Pluribus Unum"
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
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> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
> 


-- 
Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University