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st: computing Cronbach's alpha for scored factors


From   Laurel Park <lpark@umich.edu>
To   Stata list <statalist@hsphsun2.harvard.edu>
Subject   st: computing Cronbach's alpha for scored factors
Date   Fri, 4 Nov 2005 13:25:26 -0500 (EST)

What is the sequence of commands to obtain the reliability score
(Cronbach's alpha) for each factor resulting from a factor analysis? For
example, my analysis resulted in 17 factors with Eigenvalues of at least
1. For each factor I want to retain the items that load at .40 or higher
(varimax rotation), and then calculate the reliability score for each of
those factors. Do I need to enter the list of retained variables by hand,
or is there a command sequence that will compute the reliability for all
the factors using only those items loading at .4 or above?

Seems like a simple question but honestly, I have not been able to find
the answer anywhere and have been looking for three days now! Many thanks.
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