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st: RE: testing for overdispersione after Poisson Regression


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: testing for overdispersione after Poisson Regression
Date   Fri, 1 Feb 2008 18:40:31 -0000

Seems as if neither is! The key is surely what other output you have,
including any indications of major or minor problems. 

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Carlo Lazzaro

testing for overdispersion after a Poisson regression,

I have obtained two opposite results:


estat gof

         Goodness-of-fit chi2  =  3599.159
         Prob > chi2(4384)     =    1.0000

. estat gof, pearson

         Goodness-of-fit chi2  =  5438.241
         Prob > chi2(4384)     =    0.0000

Which one is trustworthy??


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