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st: factor analysis

From   Li-Ling Yang <>
Subject   st: factor analysis
Date   Sat, 27 Sep 2003 00:02:35 -0500 (EST)

Hi Stata listeners,

I am using the Stata commands -factor- (factor analysis) and -score- (to
create scores for different factors) for my study.  I have 12 items and
the factor analysis results show 4 different factors.  I can generate
scores for the 4 different factors in 2 different ways.  First,

. factor item1-item12
. score f1 f2 f3 f4  // so basically, do all of these at once


. factor item1-item12  //say, item1-3 for Factor1; item4-6 for F2, etc.
. factor item1-item3
. score f1 		// This generates the score for Factor 1
. factor item4-item6
. score f2 		// This generates the score for Factor 2
. factor item7-item9
. score f3 		// This generates the score for Factor 3
. factor item10-item12
. score f4 		// This generates the score for Factor 4

I know the Stata menu uses the first way, but is the second way wrong?
The first way and the second way give different results.  Which one is
more accurate?

Really appreciate.


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