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st: zip vs. Hurdle


From   Johanna LEPEULE <lepeule@vet-nantes.fr>
To   statalist@hsphsun2.harvard.edu
Subject   st: zip vs. Hurdle
Date   Fri, 10 Nov 2006 17:05:25 +0100

Hi

I use a zip model and the parameters estimated by zip predict a low probability of observations being a Poisson zero. Thus, it seems to me that a Hurdle regression model could be more adapted with a logistic part to predict zero and a Poisson part for nonzero.
However, I think that the results will be not very different between the zip and the Hurdle regression model.

To your opinion, Is it true ?

Thanks
Johanna Lepeule


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