Statalist


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: AW: MLOGIT versus a set of LOGIT models


From   "Jon Heron" <Jon.Heron@bristol.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AW: MLOGIT versus a set of LOGIT models
Date   Tue, 18 Aug 2009 17:46:37 +0100 (BST)

 thanks Martin,

 I've been away from statalist for a couple of years
 + rejoined immediately prior to my posting

 i'll visit the FAQ


 J


On Tue, August 18, 2009 5:31 pm, Martin Weiss wrote:
>
> <>
>
>
> In the absence of a -version- statement, your code is problematic as it
> still uses -xi- which has been superseded in Stata 11. Note the FAQ on
> this
> point.
>
> I think you will get more/better answers if you frame your question in
> terms
> of the example in the help file...
>
>
>
> HTH
> Martin
>
>
> -----Ursprüngliche Nachricht-----
> Von: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Jon Heron
> Gesendet: Dienstag, 18. August 2009 18:14
> An: statalist@hsphsun2.harvard.edu
> Betreff: st: MLOGIT versus a set of LOGIT models
>
>  Dear all,
>
>
>  I have always believed that the regression estimates from a multinomial
> logistic
>  regression model (MLOGIT) could be replicated through a set of simple
>  logit models with the appropriately derived binary outcomes.
>
>  Whilst attempting to demonstrate this fact for some teaching material on
>  polytomous IRT that i am writing, I moved from my usual categorical
>  predictors to a continuous covariate + discovered that the above
> equivalence
>  did not hold.
>
>  To ensure that this was not a fluke, I have since demonstrated that with
>  the two simple models below, each with the same 4-level outcome and
> 4-level
>  predictor, the former can be replicated with logits, but not the latter.
>
>  xi: mlogit ghq1 i.ghq3, baseoutcome(0)
>  mlogit ghq1 ghq3, baseoutcome(0)
>
>
>  please can anyone put me out of my misery?
>
>
>  cheers,
>
>
>
>  Jon
> --
> Dr Jon Heron
> ALSPAC Stats Team Leader
> Department of Social Medicine
> University of Bristol
> Oakfield House
> Oakfield Grove
> Bristol
> BS8 2BN
>
>
> *
> *   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/
>
>
> *
> *   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/
>


-- 
Dr Jon Heron
ALSPAC Stats Team Leader
Department of Social Medicine
University of Bristol
Oakfield House
Oakfield Grove
Bristol
BS8 2BN


*
*   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/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index