[Limdep Nlogit List] nlogit, crosstab, list
Charles.Raux at laet.ish-lyon.cnrs.fr
Fri Nov 3 02:19:36 AEDT 2017
I am trying various options of nlogit and getting weird or no results.
nlogit ;choices=air, car, bus, train, none
;model:U(air, car, bus, train, none)=<asca, ascc, ascb, asct, 0>
+<da, dc, db, dt, 0>*duration+pc*price
The model estimates fine, the option keep too. But with crosstab I get only zeros in XTAB_PRB and XTAB_FRQ.
When I add "list" the predictions are listed
PREDICTED PROBABILITIES (* marks actual, + marks prediction.)
Indiv AIR CAR BUS TRAIN NONE
1 .4223*+ .3993 .0686 .0593 .0505
2 .2120 .0752 .0054 .6232*+ .0842
But I get an error message "Error 803: Hessian is not positive definite at start values."
And some parameters are fixed. This error doesn't happen when I don't use the option "list".
What is wrong with these two issues?
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