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st: gologit2 and mlogit coefficients do not agree


From   "Rauscher, Garth" <garthr@uic.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: gologit2 and mlogit coefficients do not agree
Date   Sun, 12 Feb 2012 18:54:16 -0600

Dear listservers,

I am unable to reproduce the coefficients that I obtain from mlogit when I
attempt to run the same model in gologit2. As a simplified example of the
problem, my dependent variable (Y) has 3 categories (0,1,2) and I have a
single binary independent variable X (0,1). Mlogit gave me the same result
I obtained when I ran separate logistic regressions comparing Y=1 and Y=2
separately with Y=0, but gologit2 did not. My results are below. At first
I thought that gologit2 might be giving the inverse of mlogit but that is
not the case.  I like the flexibility of gologit2 but am not sure how to
interpret it's results.

Thanks for listening, Garth


. mlogit   y x , rrr baseoutcome(2)

Multinomial logistic          Number of obs   =    730
                              LR chi2(2)      =  25.52
                              Prob > chi2     = 0.0000
Log likelihood = -754.39125   Pseudo R2       = 0.0166

-------------------------------------------------------
            y |        RRR   Std. Err.      z    P>|z|
-------------+-----------------------------------------
0           x |   .3853242   .1040091    -3.53   0.000
1           x |   .3950005   .0858599    -4.27   0.000
2             |  (base outcome)
-------------------------------------------------------


. gologit2 y x, npl or

Generalized Ordered Logit    Number of obs   =    730
                             LR chi2(2)      =  25.52
                             Prob > chi2     = 0.0000
Log likelihood = -754.39125  Pseudo R2       = 0.0166

-------------------------------------------------------
           y | Odds Ratio   Std. Err.      z    P>|z|
-------------+-----------------------------------------
0           x |   1.822296   .4744057     2.31   0.021
1           x |   2.554348   .4826326     4.96   0.000
-------------------------------------------------------

Garth H Rauscher
Associate Professor of Epidemiology
UIC School of Public health
(312)413-4317
garthr@uic.edu

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