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Re: st: defiing the reference category in multinominal logistic regression


From   Dan Waldo <dan_waldo@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: defiing the reference category in multinominal logistic regression
Date   Sat, 28 Mar 2009 09:47:07 -0700 (PDT)

Sorry -- I should have been more concise:
Is there a way to force mlogit to use the omitted category from
-char depvar[omit] #
as the base outcome (reference group)? Or must I repeat this with the
b(#) option in the mlogit command?

The repetition is not difficult ... but I have a lot of regressions to run and therefore a lot of opportunities to make an error in defining the reference group.

--- On Sat, 3/28/09, Joao Ricardo F. Lima <jricardofl@gmail.com> wrote:

> From: Joao Ricardo F. Lima <jricardofl@gmail.com>
> Subject: Re: st: defiing the reference category in multinominal logistic  regression
> To: statalist@hsphsun2.harvard.edu
> Date: Saturday, March 28, 2009, 11:39 AM
> Dan,
> 
> I don´t know if understood your question. However, from
> the -h mlogit-:
> 
>  baseoutcome(#) specifies the value of depvar to be treated
> as the
> base outcome.  The default is to choose the most
> frequent outcome.
> 
> 
> HTH,
> 
> Joao Lima
> 
> 
> 2009/3/28 Dan Waldo <dan_waldo@yahoo.com>:
> > Hello, all ...
> >
> > I am running Stata10/SE, and am doing a series of
> multinomial logistic regressions.
> >
> > It's clear that Stata uses information from the
> > char ageg[omit] 3
> > instruction (for example) when setting up the
> explanatory variables. But such is not the case for the
> dependent variable.
> >
> > Again for example, the variable flushot is dichotemous
> with values 1,2 referring to yes,no.
> >
> > -char flushot[omit] 2
> > -xi: svy: mlogit flushot i.adjsmoker i.ageg i.rostsex
> i.myrace i.my_income i.my_ed i.my_dwell i.placepar , rr
> >
> > produces a regression in which (flushot==Yes is the
> base outcome)
> >
> > -xi: svy: mlogit flushot i.adjsmoker i.ageg i.rostsex
> i.myrace i.my_income i.my_ed i.my_dwell i.placepar , rr
> b(2)
> >
> > produces a regression in which (flushot==No is the
> base outcome)
> >
> > Am I out of luck is hoping that Stata will use the
> default reference category when the variable is used as a
> dependent variable?
> >
> > Dan Waldo
> >
> >
> >
> > *
> > *   For searches and help try:
> > *   http://www.stata.com/help.cgi?search
> > *   http://www.stata.com/support/statalist/faq
> > *   http://www.ats.ucla.edu/stat/stata/
> >
> 
> 
> 
> -- 
> ----------------------------------------
> Joao Ricardo Lima, D.Sc.
> Professor
> UFPB-CCA-DCFS
> Fone: +5538396022774
> Skype: joao_ricardo_lima
> ----------------------------------------
> 
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
> 


      

*
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