[R] pca analysis: extract rotated scores?

Mark Difford mark_difford at yahoo.co.uk
Wed Dec 1 15:20:19 CET 2010

Hi He Zhang,

>> Is the following right for extracting the scores?
>> ...
>> pca$loadings 
>> pca$score


But you should be aware that the function principal() in package psych is
standardizing your data internally, which you might not want. That is, the
analysis is being based on the correlation matrix rather than on the
covariance matrix. The two analyses (and the "default" biplots that issue
from them) have somewhat different properties. You should know about these.

Regards, Mark.
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