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Re: st: Poisson regression -not concave-

From   Maarten buis <>
Subject   Re: st: Poisson regression -not concave-
Date   Mon, 7 Jun 2010 07:49:15 +0000 (GMT)

--- On Mon, 7/6/10, Paolina Medina wrote:
> I'm trying to run a poisson regression model in which the
> dependent variable is the number of mobile phones from the
> households, and among other explanatory variables i am
> using a dummy wariables which takes the value of 1 when
> the household has at least one cell phone and zero
> otherwise.

Sounds to me you want to do something like a -zip- rather
than a -poisson-, i.e. you want to handle the zero counts
differently from the other counts.

Hope this helps,

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen


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