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Re: st: What should I do if stata can not show the result of nbreg

From   Muhammad Anees <>
Subject   Re: st: What should I do if stata can not show the result of nbreg
Date   Sun, 8 Jan 2012 13:36:32 +0500

A little picture of what you really did with -nbreg- will help us
understand your problem and also indicate what version of Stata is

On Sun, Jan 8, 2012 at 1:24 PM, Ye SUN <> wrote:
> Dear all
> My dependent variable is count number: the number of boards that a
> director serves in (this kind of data seems not fit to poisson)
>  I first try poisson regression and get the results and then I  try
> -estat gof-  to test whether there is overdispersion problem, it is
> insignificant indicating no overdispersion problem I think.
> I also try -zip- and get similar results, and vuong test indicates
> there is no excess zero problems I think.
> I also want to try negative binomial regression,(  nbreg  and zinb ),
> but stata run for quite a long time and still run without showing any
> results. What does that mean? Dose it mean that nbreg is inappropriate
> here?
> I want to ask, if -estat gof- after -poisson- shows the insignificant
> results, can I say this poisson model is OK and do not need to provide
> negative binomial regression results?
> Thanks for your help!
> SUN Ye
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Muhammad Anees
Assistant Professor/Programme Coordinator
COMSATS Institute of Information Technology
Attock 43600, Pakistan

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