st: compair mean: prcomp & prcompW

[Xavi Barber <xbarber@altern.org>]

I'm a new user in stata.

When I use prcompw command, but stata say: 1: operator invalid.

My command line is: prcomp gadnew gadcfa

And if i use the prcompw command, stata say again :  1: operator invalid.

Which is the problem?

thanks

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