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Re: st: subpopulations, subpopulation weights in gllamm


From   Lisa Marie Yarnell <lisayarnell@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: subpopulations, subpopulation weights in gllamm
Date   Sat, 29 Oct 2011 10:41:03 -0700 (PDT)

As a follow-up to my question, it is important to preserve the validity of pweight when I run these subpopulation models.  If I am interested in running the model for the subpopulation of overweight youth in the sample, how do I specify that I want to run the model only for that subpopulation (but preserve the validity of the sampling weight)?

Thanks!


--- On Sat, 10/29/11, Lisa Marie Yarnell <lisayarnell@yahoo.com> wrote:

> From: Lisa Marie Yarnell <lisayarnell@yahoo.com>
> Subject: st: subpopulations, subpopulation weights in gllamm
> To: statalist@hsphsun2.harvard.edu
> Date: Saturday, October 29, 2011, 4:39 AM
> 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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