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Re: st: Confusion specifications GLM

From   Maarten buis <>
Subject   Re: st: Confusion specifications GLM
Date   Mon, 24 Mar 2008 13:05:25 +0000 (GMT)

--- "Peter F. Schmidt" <> wrote:
> thanks for the hint. that seems to the right model. i tried to use
> the ztnb but stata gives the error message that convergence could not
> be achieved. on the ucla stata page is a warning that the method
> be problematic with a small sample, but it is unclear what is a small
> sample. i have 180 observations. do you have any idea how to get the
> regression running?

One thing you could do is to estimate a -ztp- model with the
-vce(robust)- option. 
Hope this helps,

Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

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