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 still uses -xi- which has been superseded in Stata 11.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: [email protected]
> [mailto:[email protected]] Im Auftrag von Jon Heron
> Gesendet: Dienstag, 18. August 2009 18:14
> An: [email protected]
> 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/
