>
> 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,
Karin
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