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st: xtmelogit model not converging


From   "Hardy, Dale S" <Dale.S.Hardy@uth.tmc.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: xtmelogit model not converging
Date   Tue, 2 Feb 2010 12:38:10 -0600

I am sending this message again. It had the wrong subject heading.



I am running a logistic mixed model and the performing gradient-based optimization iterations are not concave, so the model is not converging. Can you tell me what can be wrong? How can I fix it?

The sample size is 117,894 observations for all variables. The model is specified below.


xi:xtmelogit hoscare i.race  i.ses  i.agegroup  sex  i.marry  i.cancer_stage   i.dxyear_cate  i.comorbid || zipcoderesidence: race, intpoints(30) covariance (unstructured) or



Thanks a bunch.


Dale






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