[Limdep Nlogit List] Error msg-Nested logit

[Ho Quoc Chinh]

Hi,

2 semicolons(;;) were used in your code. Only one ; is neccessary.

Further, try this tree specification instead. 
Tree=TTTa,TTTb,(NTTTa,NTTTb);

Good luck .

Sent from my iPhone

On Mar 13, 2010, at 4:05 AM, "Gonzalez, Juan" <jgonzalez at rti.org> wrote:

Hi,



I am running a nested logit model but the program is not letting me
specify an IVSET command. Here is the code I am using:



NLOGIT;     Lhs=prefer1,count,altij;



           Choices = TTTa,TTTb,NTTTa,NTTTb;



           rhs = ANG100,...; 



           tree=TT TT[(TTTa),(TTTb),(NTTTa,NTTTb)];;



           ivset:(TTTa,TTTb);

           printvc;

           Checkdata $



This is basically the specification provided in the NLOGIT manual to
jointly model RP and SP data. The only difference here is that I don't
have a fixed number of choices so, under LHS,  I added:



Count = # of options in each question



ALTij = Number for the alternative respondents see.  



I think this is the right thing to do with a variable number of choices.
Everything else is pretty much standard (I think). 



The error message I keep getting is :



 Error    71: Variable list contains a name not in the expected table.

 Error   539: Variable list: The unidentifiable string is TTTA

 Error  1092: IVSET:( list ) ... Unidentified name appears in (list)

 Error  1092: IVSET:( list ) ... Unidentified name appears in (list)



The error goes away if I comment the IVSET line. Can someone help me
identify what I am doing wrong? Thanks in advance for your help!



Juan Marcos





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