On May 5, 2011, at 12:40 PM, yoav baranan wrote:
Here is an example for my earlier question.
Say you have a 3x3 correlation matrix:
corrs <- matrix(c(0.25,0.32,0.66,0.14,0.24,0.34,0.44,0.34,0.11),
nrow=3, ncol=3, dimnames = list(c('varA','varB', 'varC'),
c('varA','varB', 'varC')))
And another matrix for the sample size of each correlation:
sizes <- matrix(c(44,68,313,142,144,207,201,100,99), nrow=3, ncol=3,
dimnames = list(c('varA','varB', 'varC'), c('varA','varB', 'varC')))
corrs looks like this:
varA varB varC
varA 0.05 0.14 0.44
varB 0.32 0.24 0.34
varC 0.66 0.57 0.50
sizes:
varA varB varC
varA 44 142 201
varB 68 144 100
varC 313 207 99
i.e., the correlation between variables A and C was 0.66 with sample
size of 313. (I got these tables from rcorr).
Why not offer the result of dput() on the result from rcorrs cone on 3
variables. Then we should have the necessary building blocks for your
original request. This way we do not have the matrix of p-values.
And as the Posting Guide clearly says ...Please post in plain text. In
your case it is particularly annoying because I do not get the
filtered version but rather you html version and the text is almost
unreadable at a font size of 10 in whatever font it is specifying!
What I want to do is to compare the correlations in each row
(probably using r.test), and then create a correlation table with
subscripts or superscripts indicating the significance
"group" (again: correlations with different superscripts, in the
same row, are significantly different from each other).
Something like this:
varA varB varC
varA 0.05b 0.14b 0.44a
varB 0.32a 0.24a 0.34a
varC 0.66a 0.57ab 0.50b
At the moment we have no way of determining what values should be post-
pended with which letters.
Of course, I don't have a 3x3 table. I have about 20 tables of at
least 7x7 each, so this is why I'm looking for methods to automate
the process.
Thanks,
Yoav
> CC: r-help@r-project.org
> From: dwinsem...@comcast.net
> To: ybara...@hotmail.com
> Subject: Re: [R] cross-correlation table with subscript or
superscript to indicate significant differences
> Date: Thu, 5 May 2011 12:17:25 -0400
>
>
> On May 5, 2011, at 10:48 AM, yoav baranan wrote:
>
> >
> > Hi, I wonder whether the following is possible with R, and whether
> > anyone has done that and can share his/her code with me. I have a
> > correlation matrix, and I want to create a correlation table
that I
> > can copy to Microsoft Word with a superscript above each
> > correlation, indicating significant differences in the same row.
> > That is, when correlations in the same row do not share
superscript,
> > it means that they are significantly different from each other.
> > thanks,yoav
> > [[alternative HTML version deleted]]
>
> An example with data and the desired result might help focus the
> discussion.
>
> This shows how to set up an example showing how extract the row
> numbers from a correlation matrix with absolute values above 0.5 but
> less than 1 (to exclude the trivial cases).
>
snipped
>
David Winsemius, MD
West Hartford, CT
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