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Re: st: xtlogit with fe for rare events

From   Austin Nichols <>
Subject   Re: st: xtlogit with fe for rare events
Date   Fri, 29 Jun 2012 11:19:42 -0400

Marc Peters <>:
That is appropriate--if you think there is unobserved heterogeneity
that calls for -xtlogit, fe- or -clogit- then you need to drop the
cases with no variation in outcomes. You have a small sample (of cases
with variation in outcomes)--better to accept that fact. You can
cluster SE in a pooled -logit- as well, but you will get biased point
estimates from -logit- in the case that the assumptions for -xtlogit,
fe- are met.

On Fri, Jun 29, 2012 at 9:07 AM, Marc Peters <> wrote:
> Dear all,
> I am running logistic regressions with CSTS data using Statas xtlogit
> with fixed effects. My dependent variable is quite rare and 2/3 of all
> the groups do not have any positive outcomes during the 20 years I
> have in my dataset. As a consequence all these groups are excluded and
> I end up with a relatively small sample. I wonder if you have any
> suggestions on how to improve the model? Are there any way to
> circumvent this problem, but still cluster the standard errors?
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