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
[email protected]
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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