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st: calculate alpha after polychoric factor analysis
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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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