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st: RE: xtpois versus xtnbreg


From   Laurel.Copeland@med.va.gov
To   statalist@hsphsun2.harvard.edu
Subject   st: RE: xtpois versus xtnbreg
Date   Mon, 22 Mar 2004 07:11:24 -0600

I believe issuing -poisgof- after the -poisson- analysis will do it.

-----Original Message-----
From: Oord, A. van den [mailto:A.v.d.Oord@tm.tue.nl]
Sent: Monday, March 22, 2004 6:12 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: xtpois versus xtnbreg


Hi All,

I have a data set where I count the number of patents for a group of 113
companies per year over a period of 12 years. For my analysis, I
currently use a random effects poisson model for panel data (the command
'xtpois'). However, to be certain that I am using the correct model, I
wish to determine whether my dependent variable is overdispersed or not.
In the case of overdispersion I have to use the random effects negative
binomial model for panel data (the command 'xtnbreg'). How can I
determine whether my dependent variable is overdispersed or not?

Thanks in advance,

Ad van den Oord

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