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st: PCA, reverse scorings

From   Juan Julio Gutierrez <[email protected]>
To   [email protected]
Subject   st: PCA, reverse scorings
Date   Thu, 27 Dec 2007 07:08:23 -0800 (PST)

Dear all, 

I am working on creating an index using PCA. 
When running PCA the first time, with the original values the loadings come up with some
unexpected signs

KI index loadings	
original variables	
skillw	-0.51811
eduatt	0.576
rd	0.55153
itexp	-0.30919

I would expect that skillw and itexp would have positive values affecting new variable I create
with the command score. I have multiplied both variables by -1 to get the opposite sign. the
results are: 

KI index loadings	
newskillw	0.51811
eduatt	0.576
rd	0.55153
newitexp	0.30919

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