Re: st: multinomial logistic regression: adjacent logits

[Constantine Daskalakis <C_Daskalakis@mail.jci.tju.edu>]

At 04:44 PM 9/29/2005, Yi-Fu Chen wrote:
> Hi, everyone,
>
> I want to run a four-category multinomial logistic model and I find the 
> comparison will be more interesting for me if I use adjacent logits.
> Does anyone know how to do multinomial logistic regression with adjacent 
> logits?
> It seems mlogit only provides baseline logits.
>
> Any suggestions are appriciated.
>
> Yi-fu

In an older version of Stata I did this through -mlogit- and using 
-constraint- for the constraints b_j = (J-j)*b. I think this is still what 
you need to do.

Example: Y is the outcome (let's say it takes on values 0, 1, and 2) and X 
and Z are predictors.

. constraint define 1 [2]x =2*[1]x

. constraint define 2 [2]z =2*[1]z

. mlogit y x z, basecategory(0) constraint(1 2)


You can assess fit by comparing unconstrained and constrained models (see 
Stata manual for mlogit, constrained models).





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________________________________________________________________
Constantine Daskalakis, ScD
Assistant Professor,
Thomas Jefferson University, Division of Biostatistics,
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   Email: c_daskalakis@mail.jci.tju.edu
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