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st: RE: non-concave in negative binomial model


From   "Maarten Buis" <M.Buis@fsw.vu.nl>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: non-concave in negative binomial model
Date   Tue, 15 Mar 2005 19:03:36 +0100

This FAQ gives a description of the *error* messages you can get during a maximum likelihood command and when they are a problem and when they can be ignored:

http://www.stata.com/support/faqs/stat/ml.html

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of wying1@umbc.edu
Sent: dinsdag 15 maart 2005 17:50
To: statalist@hsphsun2.harvard.edu
Subject: st: non-concave in negative binomial model

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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