[Limdep Nlogit List] Nlogit crosstabs Slight change in what follows.
Durham, Cathy
cathy.durham at oregonstate.edu
Tue Aug 24 10:49:33 EST 2010
I've come to the realization that the actual v. predicted table produced from the ;crosstab statement with an nlogit run is not what I expected. I reproduced the values resulting from
;list
by writing out the formulas to create predictions and they are what I expected, but using the same principles to replicate the crosstab output does not. One would think the correctly predicted numbers would be the same.
The Nlogit 3.0 reference manual (p.N3-21) says the predictions are obtained as the Integer part of the formula Sum over t P^ sub jt times y sub jt
What exactly are P^ and y in this formula?
Is t the choice set, and is j the alternative?
In the printout tabulations are headed with the following.
| Cross tabulation of actual vs. predicted choices. |
| Row indicator is actual, column is predicted. |
| Predicted total is F(k,j,i)=Sum(i=1,...,N) P(k,j,i). |
| Column totals may be subject to rounding error. |
Thanks.
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