[R] Correlation Matrix in R

[William Revelle]

Alex,

corr.test in psych will give you a matrix of correlations, a matrix of sample sizes, and a matrix of probabilities.

You can combine the correlations and the probabilities to form what you want:

  try the following:

> library(psych)
> examp <- corr.test(sat.act)
> mat.c.p <- lower.tri(examp$r)*examp$r + t(lower.tri(examp$p)*examp$p)
> mat.cp

Bill



On Oct 26, 2011, at 6:03 AM, AlexC wrote:

> Thank you for your quick reply and helpful advice.
> 
> Using this argument allows me to do what I needed to do
> 
> Now the only other thing I wanted to accomplish was to obtain the top half
> of the matrix with p values 
> and the bottom half with the correlations, to observe the significant
> correlations.  I have been able to use a few functions such as rcorr, and
> cor.matrix to get such information but it isn't output in a format that I
> can save with the write.table function or write.clipboard
> 
> the pair function allows a graphical display of the data on the other hand
> (with correlation graphics on the bottom half) and I have added an argument
> which allows to view the significant p values.  But I wanted to know if I
> could also do the above easily.
> 
> --
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William Revelle		           http://personality-project.org/revelle.html
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