[R] Adjusting p values of a matrix

[Benno Pütz]

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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