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Re: st: IIA violations and subsequent steps


From   "Xiaoheng Zhang" <zhangx@tcd.ie>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: IIA violations and subsequent steps
Date   Mon, 6 Aug 2007 12:27:55 +0100

Thanks Maarten.I am reading the help file.

On 06/08/07, Maarten Buis <M.Buis@fsw.vu.nl> wrote:
>
> -----------------------------------------
> 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/
> -----------------------------------------
>
> --  Douglas Garrett <d.garrett@utoronto.ca> 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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>
>


-- 
Greetings,

Xiaoheng Zhang (Kevin)
*
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