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st: Missing standard errors in multinomial logit


From   serena.trucchi@unito.it
To   statalist@hsphsun2.harvard.edu
Subject   st: Missing standard errors in multinomial logit
Date   Sat, 9 May 2009 19:00:45 +0200 (CEST)

I am trying to estimate choices about living arrangements
by a multinomial logit (mlogit).
If I use more than one dummy variable (ex regional
dummies, or sex and a dummy for employee)  stata fails to
compute standard errors of the coefficient of the constant
term (they are missing in the output table and zero in the
variance/covariance matrix).
How can I solve my problem?

Thanks.
Serena Trucchi
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