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AW: st: negative binomial model
From
"Mareike" <[email protected]>
To
<[email protected]>
Subject
AW: st: negative binomial model
Date
Sun, 20 Jun 2010 22:04:08 +0200
Thank you, Maarten, for your hint.
Now that I tried to run both the Poisson model with fixed and random
effects, with the RE specification actually the same problem occurred again.
This probably implies that there is really no other choice but to dropp some
of the explanatory variables?!?
Mareike
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Maarten buis
Gesendet: Sonntag, 20. Juni 2010 19:04
An: [email protected]
Betreff: Re: st: negative binomial model
--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany
http://www.maartenbuis.nl
--------------------------
--- On Sun, 20/6/10, Mareike wrote:
> I want to analyze count data. Given that for several
> reasons the Poisson analysis showed to be inappropriate,
> my idea was to run a negative binomial model(using the
> command xtnbreg because I have panel data). But what
> happened was that Stata was giving me one iteration after
> the other (what appeared in the result window lokked like
> the following:
> Iteration 14721:log likelihood = -53.558237 (not
> concave)
> and after 3 hours and ten thousands of iterations I stopped
> the program without having gotten any result.
> Does anybody of you have an idea of what happened? I didn't
> have the problem when running the Poisson model using the
> same dataset.
It means that the model is too complex for your data, so you
need to simplify your model, either move back to -xtpoisson-
or remove some explanatory variables.
Hope this helps,
Maarten
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