[Limdep Nlogit List] Joint logit model in NLOGIT5

[minal srivastava]

Dear All,

I want to create sub models for different choice dimensions (residential location, workplace location & mode choice) and represent inter dependencies amongst these choices by using common random parameters in each utility equations. The basic idea is depicted in the utility functions for each choice dimension :


U(residential) = a1X1 +  ⍦(residential)(Workplace)+ ⍵ (residential)(travel mode) +⍷

U(workplace) = a2X2 +  ⍦(residential)(Workplace) +⍬(workplace)(travel mode) +⍷

U(travel mode) = a3X3 + ⍵ (residential)(travel mode)  +⍬(workplace)(travel mode) +⍷

Where an and Xn are the coefficients and vector of explanatory variables. ⍷1, ⍷2 and ⍷3 are the error terms while, ⍦(residential)(Workplace), ⍵ (residential)(travel mode) and ⍬(workplace)(travel mode)  are the random components to capture the inter dependencies of choices made. So 
My query is how can I code this in NLOGIT for the three choice processes to function as sub models in tandem with each other?

Any help would be highly appreciated. 

Regards,
Minal