Re: st: not concave Poisson estimation

[Morten Hesse <mh@crf.au.dk>]

I must learn that I lose the first line when I send to Statalist. Sorry 
for double posting!

 First of all, you should use xtpoisson. Next, you should check if 
there are exporters, importers or years, where you have no variation.
Greetings
Morten


Den 10-09-2010 12:56, Morten Hesse skrev:
> 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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