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st: excess zeroes in panel models for count data

From   "Ángel López Nicolás" <>
Subject   st: excess zeroes in panel models for count data
Date   Mon, 29 May 2006 12:56:10 +0200

I am trying to estimate a count data model with panel data and would
like to try specifications that allow for excess zeroes (zero-inflated
and hurdle models) with fixed unobserved heterogeneity over time. I
can see that stata has commands to deal with excess zeroes in cross
sectional models  (zinb, zip, hnblogit, etc.) and also has some basic
panel models for count data (xtpoisson y xtnbreg). My question is: is
it possible to combine the specs. for excess zeroes with fixed or
random effects. If so, are there commands or variations of commands
that deal with this? Thanks in advance.

Ángel López Nicolás
Departamento de Economía
Facultad de Ciencias de la Empresa
Universidad Politécnica de Cartagena
Paseo Alfonso XIII, 50
30203 Cartagena
Tel. 968 325484
Fax. 968 325781

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