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Re: st: xtmelogit model not converging


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: xtmelogit model not converging
Date   Wed, 3 Feb 2010 07:01:19 -0800 (PST)

--- On Tue, 2/2/10, Hardy, Dale S wrote:
> 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 standard advise is to simplify the model, so remove the
random coeficient for race, if that model converges you can
try a model with random coefficient for race, if that model
converges you can try to relax the covariance between the
random coefficients by adding the -covariance(unstructured)-
option.

-- Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://www.maartenbuis.nl
--------------------------


      

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