[R] princomp scores reproduced

Spencer Graves spencer.graves at pdf.com
Tue Aug 19 03:33:31 CEST 2003

	  You might get a more informative response if you provide a toy 
example with data and what you did that almost but not quite produced 
the correct numbers.  The easiest questions to answer often come with 
data and sample code that can be copied directly from an email message 
and pasted into R.  Then someone can experiment with alternatively ways 
of doing something without taking much time away from the things they 
are paid to do.

	  Otherwise, we can only guess what you did that did not produce the 
answer.  There are an infinite number of ways to do anything wrong, and 
often even an infinite number of ways to get almost the right answer.

sorry i couldn't be more helpful.  spencer graves

array chip wrote:
> Hi,
> I used "princomp" for PCA analysis based on
> correlation matrix (cor=T). I would like to reproduce
> the scores for each observation by first standardizing
> the data matrix (mean=0, std err=1), and then
> multiplied by the loadings of each variable for each
> principle components. I get very close numbers, but
> not exactly the same. anything I missed here?
> tahnks
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