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st: Negative Binomial Panel data


From   "Taillard, Jerome" <taillard_1@cob.osu.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Negative Binomial Panel data
Date   Fri, 26 Nov 2004 10:00:53 -0500

Dear All,
 
I know that the negative binomial distribution simplifies into a Poisson distribution when the overdispersion factor goes to zero. 
I am performing the negative binomial panel data regression (xtnbreg) in Stata. And it is not clear for me, in that case, if it simplifies to a Poisson panel data when r and/or s are not statistically different from zero.  
Any help will be greatly appreciated.
 
Jerome Taillard

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