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.
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