R help - Jul 2003 - How to generate a matrix with a specific correlation (matrix)

Dear R community:

How to generate a matrix with a specific correlation (matrix)?
Thanks in advance.

Rui
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If var(X) = diag(n) = n x n identity matrix, then var(A%*%X) = A %*% 
t(A).

	  If you can generate vector(s) X of uncorrelated observations with 
whatever distribution you want, then let A = t(chol(Correl)), where 
Correl = the desired correlation matrix.

	  If you want multivariate normal or t distributions, the package 
mvtnorm downloadable from CRAN will do this for you.

	  If this does not solve your problem, I suggest you provide a toy 
example that explains very succinctly what you want, what you've tried, 
and the deficiencies in what you've tried.

hope this helps.  spencer graves

rui wrote:
> Dear R community:
> 
> How to generate a matrix with a specific correlation (matrix)?
> Thanks in advance.
> 
> Rui
> 	[[alternative HTML version deleted]]
> 
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