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Re: RE: st: Longitudinal zero-inflated Poisson model

From   Clyde B Schechter <>
To   "" <>
Subject   Re: RE: st: Longitudinal zero-inflated Poisson model
Date   Mon, 30 Jan 2012 16:03:40 +0000

Thanks to Richard Williams and Cameron McIntosh for their suggestions.

I have fit a random-effects negative binomial model to the data--and the results are fairly close to what I got from a random-effects Poisson model, and, at least in terms of the coefficient estimates, also very close to a zero-inflated Poisson model that ignores the longitudinal structure and treats the observations as if they were independent.

-findit- turned up nothing, but I had hoped that somebody out there had implemented longitudinal ZIP models in Stata--but so far nobody has identified one.  I may have to use other software for this particular analysis.  I don't have the time or skills to try to program it myself.

Clyde Schechter

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