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Re: st: not concave Poisson estimation


From   Estrella Gomez <estrellastata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: not concave Poisson estimation
Date   Fri, 10 Sep 2010 13:33:09 +0200

Dear Morten

Thank you for your response. Now I have changed the specification,
since there is no variation over importer and exporter. (xtpoisson was
specified, but I did not transcript it correctly)

xtpoisson depvar indepvars i.year, re

However, I still have the same problem. Any further idea?

Thanks again
Regards,
Estrella
2010/9/10 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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>>
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