--- 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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