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st: Problem determining categories after mlogtest


From   "Pungkas B. Ali" <pungkas.ali@gmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Problem determining categories after mlogtest
Date   Thu, 9 Sep 2010 13:10:59 +1000

Dear All,

I run an MNL model (Stata 10) for health provider choice. In the model  I
have 7 categories (options) in the dependent variable and several
socio-economic and demographic independent variables:

. mlogit  prov_type symptoms self_treat age daymiss insured hhsize rural
edu_sec married female, base (0)

Then I run:

. mlogtest, lr hausman

Stata gave me the lr test and hausman test result, but after this message: 

Problem determining categories

I tried to regroup the depvar into 2 or 3 categories, but it still gave me
the "Problem determining categories" warning.
What mistake did I make? Are the lr and hausman test results still valid?

My depvar is : 
0 No 
1 Pubhos 
2 HC 
3 PriHos 
4 Clinic 
5 Phys 
6 Parad 
7 Trad

Any help would be very appreciated.

Pungkas


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