Message-ID: <4394AA2D.4090300@statistik.uni-dortmund.de>
Date: 2005-12-05T20:59:25Z
From: Uwe Ligges
Subject: correlate vector & report p-value
In-Reply-To: <200512051952.OAA25895@webmail20.cac.psu.edu>
Vivien W. Chen wrote:
> Dear all,
>
> I've been struggling with this through this weekend, I finally decided to ask
> help from you. Please let me know if there is effective way to deal with this
> problem. Thanks!
>
> Here is the problem:
>
> I have two matrices.
>
> Matrix A:
>
> a b c
> 4 5 2
> 3 2 1
> 4 5 6
>
> Matrix B:
> d e f g h
> 3 4 5 2 1
> 2 3 7 8 6
> 8 5 1 3 4
>
> I would like to correlate vector a of matrix A with with vectors d,e,f,g,h of
> matrix "B" and save the p-value in a seperate result vector. Then, I would like
> to repeat this process using vector b of matrix A. Then, I would like to do
> this for vector c of matrix A.
To get all correlation coefficients:
cor(A, B)
Which p-value do you mean, those from cor.test?
You can get all by:
apply(A, 2, function(x)
apply(B, 2, function(y) cor.test(x,y)$p.value))
Uwe Ligges
> Vivien W. Chen
>
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