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st: robust cluster in GLM


From   "Leny Mathew" <lenymathewc@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: robust cluster in GLM
Date   Tue, 16 Sep 2008 15:46:30 -0400

Dear Statalisters,
                          I'm using a GLM model with robust cluster
option to model longitudinal data across three time points. I have the
dependent variable on 80 cases at T1 and T2, but have only 77 at the
third time point. When I run the model the number of observations is
237, but it says that the standard error is adjusted for 80 clusters.
Why would this be the case? How does stata take the missing info for
the 3 people at T3 into consideration when it calculates the
parameters and SE?

Thanks in advance for any suggestions,

Leny
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