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st: heckman and negative binomial?

From   David Huffer <>
To   "Statalist@Hsphsun2. Harvard. Edu (" <>
Subject   st: heckman and negative binomial?
Date   Thu, 24 Apr 2003 16:18:09 -0400

Does anyone have a suggestion for a situation where negative binomial
regression or possibly poisson is appropriate but the data are
sample-selected.  For instance, there are a group of respondents sent to a
certain treatment and a researcher is interested in modeling the number of
times those respondents experience event X.  Since respondents were sent to
treatment based on some non-random characteristics, there is a need to
account for that selection problem.  

A colleague wants to use heckman's correction but I have no experience
mixing that with a negative binomial model.  Can anyone weigh in on that?  

Much thanks!

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