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st: IV parameter nlogit model

From   "Karin Oudshoorn, Twentestat" <>
Subject   st: IV parameter nlogit model
Date   Wed, 2 Jan 2013 19:48:19 +0100

> Dear Stata-users, 

A week ago I also send the question below. I did not get suggestions maybe due to the holidays, therefore I post it again: 
> I am estimating a nested logit model on a conjoint dataset with a degenerate branche ( for no screening) and a branche of two alternatives. 
> I constrain the IV parameter of the degenerate branch to one. 
> So now I get an estimate for the other IV parameter which is 1.89 and the test for IIA(tau=1) is significant. 
> How can I interpret this IV parameter? 
> It is above one. So do I have a problem now? 
> And what does the test IIA ( tau=1) tell me on the two choices ( for or against screening) and between the two alternatives? 
> Thanks in advance, 
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