[R] Factor loadings and principal component plots

[Jari Oksanen]

On Tue, 2004-05-04 at 09:34, Prof Brian Ripley wrote:

> 
> Yes, but princomp is the recommended way, not prcomp.

But the documentation seems to recommend prcomp:

?prcomp:

 
     The calculation is done by a singular value decomposition of the
     (centered and scaled) data matrix, not by using 'eigen' on the
     covariance matrix.  This is generally the preferred method for
     numerical accuracy.

?princomp:

     The calculation is done using 'eigen' on the correlation or
     covariance matrix, as determined by 'cor'.  This is done for
     compatibility with the S-PLUS result.  A preferred method of
     calculation is to use 'svd' on 'x', as is done in 'prcomp'.

Just confused, jari oksanen
-- 
Jari Oksanen <jarioksa at sun3.oulu.fi>