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st: subpopulations, subpopulation weights in gllamm


From   Lisa Marie Yarnell <lisayarnell@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: subpopulations, subpopulation weights in gllamm
Date   Sat, 29 Oct 2011 01:39:44 -0700 (PDT)

Hello!  I estimated some models using gllamm that had persons nested in schools, and had grand sample weights applied.  For example, I ran this model:
gllamm notdep bmi boy aa hispanic ses, i(schoolid) family(binom) link(logit) eform pweight(wt)


If I want to run the model for subgroups such as overweight / not overweight, is it sufficient to simply type "if overweight = 1" in the model, like this:
gllamm notdep bmi boy aa hispanic ses, i(schoolid) family(binom) link(logit) eform pweight(wt) if overweight = 1


OR do I need to put the subgroup somewhere else in the model, as in some versions of Stata outside of the gllamm module, such as:
gllamm(overweight) notdep bmi boy aa hispanic ses, i(schoolid) family(binom) link(logit) eform pweight(wt)


I would like gllamm to use proper subpopulation weighting when I select the overweight group.  I would be really appreciative of any help I can get with this.  Thank you for your time.
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