Thank you very much!
Mariarosaria
Citazione Nick Cox <[email protected]>:
> In Stata 8, you should use -score- not -predict, score-
> for this purpose, as is explained in the on-line help.
>
> Nick
> [email protected]
>
> [email protected]
>
> > 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.
>
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
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