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Re: st: RE: Principal Component Score


From   agostino@unical.it
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Principal Component Score
Date   Fri, 16 Sep 2005 15:42:19 +0200

Thank you very much!
Mariarosaria
Citazione Nick Cox <n.j.cox@durham.ac.uk>:

> In Stata 8, you should use -score- not -predict, score-
> for this purpose, as is explained in the on-line help. 
> 
> Nick 
> n.j.cox@durham.ac.uk 
> 
> agostino@unical.it
> 
> > I'm using STATA 8 for a Principal Component Analysis, as I'm 
> > interested in 
> > building one index out of three covariates (i.e.  I need to 
> > get the first 
> > principal component score). 
> > 
> > What I do is the following: 
> > 
> > I type: pca x1 x2 x3 
> > 
> > and obtain eigenvalues and eigenvector, 
> > straightafter I type 
> > 
> > predict pc1, score 
> > 
> >  and I get the red message: last estimates not found! 
> > 
> > I have tried several times, also changing the computer...but 
> > the red message 
> > always pops up. 
> 
> *
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> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
> 




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