<>
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still uses -xi- which has been superseded in Stata 11.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
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