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Re: st: gllamm with pweights


From   ucjtpsf@ucl.ac.uk
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: gllamm with pweights
Date   Thu, 16 Jul 2009 19:50:39 +0000

-----Original Message-----
From: "Kanter, Rebecca" <rkanter@jhsph.edu>

Date: Wed, 15 Jul 2009 18:37:42 
To: statalist@hsphsun2.harvard.edu<statalist@hsphsun2.harvard.edu>
Subject: st: gllamm with pweights


Hi,

I am running 2 level multi-level models using gllamm. Level one is individuals and Level two is either the urban or rural part of the country's state (i.e. urstate).

I would like to use the survey pweights I have...I only have pweights for the individual level (adul_sr), but it seems that you need pweights for all levels specified in gllamm (?) so this is what I did to create pweights for urstate based on these weights:

collapse (sum)  sadul_sr=adul_sr , by(urstate)

then I merged them to the rest of my dataset

and made this weight for the gllamm:

*MLM-level pweights
generate pwadulsr1=adul_sr
*urstate summed adul_sr
generate pwadulsr2=sadul_sr

Then ran the most basic random-intercept only (around urstate) in gllamm and get the follow error below and am assuming it is a pweight problem but I do not know where the problem is coming from so if anyone has insight that would be much appreciated. Thanks so much!

(note: diettag==1 & exwt==1 is the subpopulation i want to look at for this series of models)

gllamm bmi2 if diettag==1 & exwt==1, i(urstate) pweight(pwadulsr) adapt nip(15)

Running adaptive quadrature

Convergence not achieved: try with more quadrature points


___________________________________________
Rebecca M. Kanter
PhD Candidate
Johns Hopkins Bloomberg School of Public Health
Department of International Health
Center for Human Nutrition

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