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st: AW: "flat region resulting in a missing likelihood" (error message)


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: "flat region resulting in a missing likelihood" (error message)
Date   Wed, 25 Feb 2009 16:57:54 +0100

<> 


Well, try to find the highest peak on a flat surface! Good luck! 

Anyway, talk a little bit more about the two variables you have in the
model. -summarize- them and put the output in your reply. What does "
country's choice of firms" mean? I would have a hard time telling Germany`s
"choice of firms"...


HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von
Isabelle.Roux@ehess.fr
Gesendet: Mittwoch, 25. Februar 2009 16:44
An: statalist@hsphsun2.harvard.edu
Betreff: st: "flat region resulting in a missing likelihood" (error message)

Hello,

I'm trying to do a multinomial logit and I write to stata: "mlogit country
taxe" where country is the country's choice of firms and taxe is corporate
tax of the country.

Stata refuses to provide results and indicates: "flat region resulting in
a missing likelihood"


In Stata's help I have this message:"convergence not achieved;
        You have estimated a maximum-likelihood model and Stata's
        maximization procedure failed to converge to a solution;
        see [R] maximize.  Check if the model is identified."

I don't know if I have a problem of stata's command or of econometrics; in
this last case, could you indicate me please which topic to study to solve
my problem?


(maybe it is a very obvious question but I am new in econometrics and I'm
a bit lost in regressions!)

Thank you very much for help,

Isabelle

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