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st: non-concave in negative binomial model


From   wying1@umbc.edu
To   statalist@hsphsun2.harvard.edu
Subject   st: non-concave in negative binomial model
Date   Tue, 15 Mar 2005 11:50:20 -0500 (EST)

Hi, all,


When I tried a series of models for count dependent variable estimation
(nbreg,zinb), there was an indication of "not concave" for the iteration 0
- 1 in "fitting constant-only model".  What does this mean?  How would
that affect my estimation?


Thanks a lot,
Ying

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