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Re: st: not concave Poisson estimation


From   Morten Hesse <mh@crf.au.dk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: not concave Poisson estimation
Date   Fri, 10 Sep 2010 12:56:24 +0200

there are exporters, importers or years, where you have no variation.
Greetings
Morten

Den 10-09-2010 12:42, Estrella Gomez skrev:
Dear statalist:

I have a panel with 5400 pair of countries and 43 years. I am trying
to estimate a Poisson model but when I assume random effects and
specify:

xtreg depvar indepvars i.exporter i.importer i.year, re

Stata keeps iterating the function over the same values during hours
and never converge

How can I solve this?

Thanks in advance
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