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st: IV parameter nlogit model


From   "Karin Oudshoorn, Twentestat" <twentestat@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: IV parameter nlogit model
Date   Thu, 20 Dec 2012 21:41:27 +0100

Dear Stata-users, 

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 againdt screening) and between the two alternatives? 

Thanks in advance, 
Karin


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