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/
