[R] Factor Analysis

Spencer Graves spencer.graves at pdf.com
Thu Feb 27 18:43:02 CET 2003

To obtain an nonsingular estimate of an (n x n) covariance or 
correlation matrix, you need at least (n+1) observations.  However, you 
can obtain estimates of the largest k singular values or eigenvalues 
with only (k+1) observations.  The principal components routine must use 
something like "eigen" or "svd", which does not require a nonsingular 
covariance matrix.

Spencer Graves

rahul.maniar at feri.de wrote:
> Hello,
> I am encountering a problem while doing factor analysis in R. I am using
> correlation matrix of the performance data of funds.And it gives me error
> message saying singular matrix in use. Now when I try to find the
> determinant of this matrix it is indeed singular. The problem is when I use
> same matrix for principal component analysis it works. I was wondering if
> any of you could help me with this.
> Rahul Maniar
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