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.
--
�ngel L�pez Nicol�s
Departamento de Econom�a
Facultad de Ciencias de la Empresa
Universidad Polit�cnica de Cartagena
Paseo Alfonso XIII, 50
30203 Cartagena
Tel. 968 325484
Fax. 968 325781
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