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st: Principal Component Score

Subject   st: Principal Component Score
Date   Fri, 16 Sep 2005 13:57:28 +0200

dear all, 
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. 
Thank you in advance for your preciuos help 
Mariarosaria Agostino 

Dipartimento di Economia e Statistica 
UniversitÓ della Calabria 

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