[Limdep Nlogit List] mnl with constant

[André Markemann]

Dear all

 

I try to estimate a simple mnl for a choice task layout with two animal
profiles (alt1 and alt2) and an opt (no buy) alternative.

I would like to obtain one constant term for both of the profiles and one
constant for the opt out.

However, including ONE as the ASC, I get two constants for alt1 and alt2,
respectively.

 

The code would look similar to this 

 

CREATE ; J = Trn(-3,0)$

crea; if(j=1) alt1=1; if(j=2) alt2=1; if(j=3) sq=1$

crea

;no_sq=1-sq$

 

Nlogit

;Lhs=y

;choices=alt1,alt2,no buy

;Rhs= DIA17,DIA21,DIA25,c1,PA2,PA3,PA4,T80,T120,TE2,TE3,PRICE,sq$

 

How do I compute a constant for the alternatives alt1 and alt2?

 

Thanks.

 

André, Germany.

 

 

 

_________________________________________________

André Markemann

University of Hohenheim (480a)

Animal Breeding and Husbandry in the Tropics and Subtropics

Garbenstrasse 17

70599 Stuttgart

Germany

Phone: +49 711 459 22477

Fax: +49 711 459 23290