Statalist


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

st: AW: MLOGIT versus a set of LOGIT models


From   "Martin Weiss" <[email protected]>
To   <[email protected]>
Subject   st: AW: MLOGIT versus a set of LOGIT models
Date   Tue, 18 Aug 2009 18:31:15 +0200

<> 


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still uses -xi- which has been superseded in Stata 11.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



© Copyright 1996–2024 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index