[Limdep Nlogit List] Error: Model is too complex

William Greene wgreene at stern.nyu.edu
Sat Aug 8 03:23:09 EST 2009

The fact that all alternatives (save I) appear in both
branches is a very bad start.  The branches in a nested
logit model cannot overlap.  There is a stray comma in 
branch AA. Your model is not identified; one of the parameter
pairs in branch AA must be normalized at zero. I would
replaace the ;MODEL:... part of the command with
The tree is something else. I guess you should just
discard branch BB.
/Bill Greene

----- Original Message -----
From: "M. (Muhammad) Sabir" <msabir at feweb.vu.nl>
To: limdep at limdep.itls.usyd.edu.au
Sent: Friday, August 7, 2009 10:16:30 AM GMT -05:00 Columbia
Subject: [Limdep Nlogit List] Error: Model is too complex

Dear all,


 I am trying to run  the following model ;



; LHS = Choice, Cset, Altij

; Choices =  A, B, C, D, E, F, G, H, I 

; Tree =   AA(A,,B, C, D, E, F, G, H), BB(A, B, C, D, E, F, G, H), CC(I)

; Start = Logit

; Show 

; Model :

U(A)   =  B10+B11*X/

U(B)   =  B20+B21*X/

U(C)   =  B30+B31*X/

U(D)   =  B40+B41*X/

U(E)   =  B50+B51*X/

U(F)   =  B60+B61*X/

U(G)  =  B70+B71*X/

U(H)  =  B80+B41*X/

U(I)   =  B90 [0]  

;Ivset : (CC) = [1.0]


;Utility = U1 $


 (All X are individual specific variables and are constant over
different choice). 


I get the following error message:  


Error  1020: The model is too complex - too many parts. Table overflow.


I could not find this error message in LIMDEP Reference Guide 9.0. 


 Can someone explain what does this error means or  what is wrong here ?


Many thanks. 


Kind regards,







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