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st: clogit problem


From   Laura Giuliano <giuliano@econ.Berkeley.EDU>
To   statalist@hsphsun2.harvard.edu
Subject   st: clogit problem
Date   Mon, 02 Sep 2002 12:18:45 -0700

Dear Statalisters,

I am trying to estimate a fixed effects (conditional) logit model
predicting the probability that a newly hired employee in a given
establishment is white as a function of the hiring manager's race,
conditional on the number of white hires in the establishment.  I have
many observations (typically over 100) per store and many positive outcomes
per establishment  (also many negative ones).  The race of the hiring
manager changes in many, but not all, establishments.  There are about 1500
establishments. 

After the first iteration, I get log likelihood = -8.988e+307, and stata
stops and prints out an empty table (see output below).  

I have had some success running the same regression using smaller
subsamples -- with fewer observations per store -- from the same data set.  

I'd greatly appreciate any explanations and/or suggestions.

Thanks very much!
- Laura  Giuliano

. clogit white mblack mhisp masian mother t2-t30, group(store)

note: multiple positive outcomes within groups encountered.
note: 114 groups (6827 obs) dropped due to all positive or
      all negative outcomes.
Iteration 0:   log likelihood = -8.988e+307

Conditional (fixed-effects) logistic regression   Number of obs   =     253398
                                                  LR chi2(33)     =          .
Log likelihood =          .                       Prob > chi2     =          .

------------------------------------------------------------------------------
       white |      Coef.   Std. Err.      z    P>|z|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
      mblack |                     .        .       .            .           .
       mhisp |                     .        .       .            .           .
      masian |                     .        .       .            .           .
      mother |                     .        .       .            .           .
          t2 |                     .        .       .            .           .
          t3 |                     .        .       .            .           .

etc.



---------------------------------------------------
Laura Giuliano                  
Department of Economics         
549 Evans Hall, MC 3880
University of California, Berkeley
phone: (510) 526-9490
email: giuliano@econ.berkeley.edu
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