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st: calculate alpha after polychoric factor analysis


From   <Seyi.Soremekun@lshtm.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: calculate alpha after polychoric factor analysis
Date   Mon, 13 Feb 2012 13:54:14 +0000

Dear Stata Listers,
 
I would like to estimate the equivalent of  Cronbach's alpha after factor analysis conducted on a polychoric matrix of ordinal, Likert items. I started out in a pretty standard way thus:
 
polychoric var1 - var29 
display r(sum_w) // check number of respondents answered all = 331
matrix r = r(R)
factormat r, n(331) factors(3) ipf
alpha?
 
Is there such functionality available, or might I have to re-do the whole analysis in R or SAS?
 
thanks,
 
Seyi
 
 
Dr Seyi Soremekun
Faculty of Epidemiology and Public Health 
London School of Hygiene and Tropical Medicine
London WC1E 7HT
+442079272464


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