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st: fixed effect logit model


From   "Levy Lee" <chtl@econ.hku.hk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: fixed effect logit model
Date   Wed, 27 Oct 2004 16:28:10 +0800

Dear Statalister,

   Just a quick and maybe naive question, why the sample size shrinked when
i estimate a fixed effect logit model using an unbalanced panel dataset?

   the question goes like this:

   i firstly estimate estimate an ordinary pulled data logit model with a
three year panel of 3107 observations for 1241 firms. when i tried the fixed
model, the observation number dropped to 1045 observations, which only
captured 427 firms. can you tell me why?

also, why these is no a similar xtprobit model for fixed effect?

thanks

Levy



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