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st: Exact Poisson regression

From   Garry Anderson <>
Subject   st: Exact Poisson regression
Date   Fri, 15 Feb 2008 22:04:31 +1100

Hi Statalisters,
Is there a method that can use exact Poisson regression when one assumes that the distribution is a negative binomial? I have a small dataset (n=21) of counts and analyses with -poisson- and -nbreg- indicate that alpha in nbreg is greater than zero (chibar2(01) =   13.21, P<0.001). I suppose an exact negative binomial regression would be preferable, but I doubt if it has been implemented.
Any thoughts would be much appreciated.
Regards, Garry

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