Re: [R] Adjusting p values of a matrix

From: Benno Pütz <puetz_at_mpipsykl.mpg.de>
Date: Mon, 04 Apr 2011 18:21:52 +0200

How about

        as.matrix(p.adjust(as.dist(pmat)))

Benno

On 4.Apr.2011, at 17:02, January Weiner wrote:

> Dear all,
>
> I have an n x n matrix of p-values. The matrix is symmetrical, as it
> describes the "each against each" p values of correlation
> coefficients.
>
> How can I best correct the p values of the matrix? Notably, the total
> number of the tests performed is n(n-1)/2, since I do not test the
> correlation of each variable with itself. That means, I only want to
> correct one half of the matrix, not including the diagonal. Therefore,
> simply writing
>
> pmat <- p.adjust( pmat, method= "fdr" )
> # where pmat is an n x n matrix
>
> ...doesn't cut it.
>
> Of course, I can turn the matrix in to a three column data frame with
> n(n-1)/2 rows, but that is slow and not elegant.
>
> regards,
> j.
>
> --
> -------- Dr. January Weiner 3 --------------------------------------
> Max Planck Institute for Infection Biology
> Charitéplatz 1
> D-10117 Berlin, Germany
> Web : www.mpiib-berlin.mpg.de
> Tel : +49-30-28460514
>
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>



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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. Received on Mon 04 Apr 2011 - 16:25:35 GMT

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