-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
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-- Douglas Garrett <[email protected]> wrote:
> I am currently running a multinomial logistic regression model and
> have found that it violates the IIA assumption. <snip>
--- Xiaoheng Zhang answered:
> I think IIA is irrelavent to the multinomial logistic regression
> because it implies that there is no correlation in terms of latent
> utility between any two alternatives. Just wondering why you think
> in your case it is violated.
IIA is an assumption underlying -mlogit-. It can be tested using
a Hausman test. For a nice example of how IIA is relevant for
-mlogit- see the help file of Jeroen Weesie's -iia- under the
heading `Some fun ("Substantive background")'. You can install
-iia- by first typing:
net cd http://www.fss.uu.nl/soc/iscore/stata/
and than:
net install iia
-- Maarten
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