R help - Dec 2005 - correlate vector & report p-value

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.

Vivien W. Chen

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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