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st: RE: using "by" for scores in factor or PC analysis


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: using "by" for scores in factor or PC analysis
Date   Sun, 6 Feb 2005 17:41:13 -0000

The reason for this is that Stata can only 
hold the last set of -pca- results in memory. 

You need some other approach, such as using 
-levels-. 

Nick 
n.j.cox@durham.ac.uk 

Amita Rantidev Chudgar
 
> Stata allows PCA or factor analysis with "by" option
> 
> so I can do
> 
> sort region
> by region : pca var1 var2 var3
> 
> but it does not allow "score" with by!
> 
> I want to use the first component as a regional index and not 
> being able
> to generate the score defeats the purpose of generating pca "by
> region"!
> 

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