From: Liaw, Andy <andy_liaw_at_merck.com>

Date: Tue 16 Aug 2005 - 03:14:07 EST

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Aug 16 03:27:48 2005

Date: Tue 16 Aug 2005 - 03:14:07 EST

*> From: Dennis Shea
**>
***> [SNIP]>>
**

It is usually a good idea to consult the help page before speculating. ?prcomp has, in its `Detail' section:

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

Andy

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R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Aug 16 03:27:48 2005

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