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Re: st: cluster and robust in logit


From   Richard Williams <Richard.A.Williams.5@ND.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>, "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: cluster and robust in logit
Date   Tue, 01 Dec 2009 18:25:33 -0500

At 05:56 PM 12/1/2009, Sue wrote:
Dear Statalisters,

I'm estimating three different logit models, one with the option
cluster(country) only, another with robust and yet another with
cluster(country) robust. The first and the third however yield the
same standard errors. Is this how it's supposed to be? Does the
cluster(.) option by default include robust for some reason? Any input
would be appreciated.

It sounds like you are either using an older version of Stata or the old Stata syntax. Either way, cluster() implies robust; specifying robust cluster() is equivalent to typing cluster() by itself.


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Richard Williams, Notre Dame Dept of Sociology
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