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st: how to get the components variable after -pca- or -fa-?
From
Grace Jessie <[email protected]>
To
<[email protected]>
Subject
st: how to get the components variable after -pca- or -fa-?
Date
Tue, 3 Apr 2012 15:11:29 +0000
Statalists:
Could anyone tell me how to get the components variable after -pca- or -fa-?
I know -predict f1- works well for the first component. However, I want to know how to calculate it? In my mind, it should equal each variable multiplied by its score. Disppointedly, it does not. Could anyone explain to me?
for example,
predict p1
(regression scoring assumed)
Scoring coefficients (method = regression)
------------------------
Variable | Factor1
-------------+----------
dv21 | 0.28335
dv22 | 0.28218
dv23 | 0.28129
dv24 | 0.27461
------------------------
So P1=0.28335*dv21+0.28218*dv22+0.28129*dv23+0.27461*dv24? Why not?
Thanks!
Grace
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