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Re: st: IIA test for multinomial logit


From   Richard Williams <[email protected]>
To   [email protected], "[email protected]" <[email protected]>
Subject   Re: st: IIA test for multinomial logit
Date   Wed, 29 Jan 2014 09:49:53 -0500

This doesn't answer your question, but Allison and others have expressed concerns about the IIA tests:

http://www.statisticalhorizons.com/iia

Also, I assume you are using Long and Freese's spost9 package of commands, but be explicit about where user-written commands come from. You might be using an old version.

At 09:41 AM 1/29/2014, Stepien, Paulina wrote:
Dear Stata Users,

I am trying to perform an IIA test for multinomial logit where dependent variable employment status (empl_st6) has 4 categories: 0 unemployed, 1 employed for wages, 2 self-employed, 3 employer. I have tried running the test in two ways, none of which seem to be working.

Firstly, I have run mlogit regression followed by mlogtest, smhsiao. This command returns following error messages: 'problem determining number of categories' and 'factor variables and time series operators not allowed'.

I have looked at the dependent variable specification but not sure what may be wrong with it. I have also looked at all potential factor variables and time series markers but even after eliminating potential culprits the test does not work. One advice I have found on stata blog is to continue setting seeds until it works, which I have tried with no success. I am not sure how many times I should try before I give up.

Secondly, I have tried running smhsiao empl_st6, elim(0) but two problems occur here: the regression fails to calculate chi2 and an error message comes up saying 'equation unemployed not found'. When I recode categories to run from 1-4 instead 0-3, the error message does not come up but chi2 is still not being calculated.

I would be most grateful if someone could advise what I am doing wrong or whether there is any solution to this problem.

Thank you in advance.

Paulina


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Richard Williams, Notre Dame Dept of Sociology
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