[Limdep Nlogit List] nested logit

[Kristy Wallmo]

The way you have it specified your model has two trunks - a drive and a non-drive (though non-drive isn't named) and within each trunk you have the elemental alternatives - z1, ...z3nx  in the drive trunk and cpool, transit, and other in the non-drive trunk.  If this is how your are envisioning the model, then the choices should only reflect the lowest level of each trunk - in this case cpool, transit, other,
z1.... z3nx.  Drive should not appear in the choices line.  See if that works.

- Kristy

Jess Becker wrote:

> Hello subscribers,
>
> I am attempting to run a nested logit in NLOGIT 3.0.  My data contain 4 alternatives (drive, carpool, transit, other) with a further nest beneath the drive option to incorporate parking options (6 lots, each with their own cost and distance to a central point).  I'm a limdep beginner so often the errors that I get rarely help me to determine what the real problem is.  Here is the code and the errors I receive:
>
> nlogit
>
> ; lhs = choice
>
> ; choices = drive,cpool,transit,other,z1,z2,z3,z45,z67,z3nx
>
> ; tree = [drive(z1,z2,z3,z45,z67,z3nx)],
>
> [(cpool,transit,other)]
>
> ; model:
>
> u(z1) = bz1 + d1*P_DIST /
>
> u(z2) = bz2 + d2*P_DIST /
>
> u(z3) = bz3 + d3*P_DIST /
>
> u(z45) = bz4 + d4*P_DIST /
>
> u(z67) = d6*P_DIST /
>
> u(z3nx) = bzx + dx*P_DIST /
>
> u(cpool) = bc + r2*dist_mac + pr*pgr_reg /
>
> u(transit) = bt + r3*dist_mac + b3*dist_bus + tp*trans_p /
>
> u(other) = r4*dist_mac + m1*m_lt30 /
>
> u(drive) = bd + r1*dist_mac + dr*drv_reg $
>
> Error: 71: Variable list contains a name not in the expected table.
>
> Error: 539: Variable list: The unidentifiable string is DRIVE
>
> Error: 1085: Unidentified name found in DRIVE)
>
> Error: 1085: Unidentified name found in DRIVE)
>
> Any hints would be greatly appreciated, many thanks in advance,
>
> -Jessica
>
> Jessica Becker
> MA Candidate
> School of Geography and Earth Sciences
> McMaster University
> Hamilton, Ontario, Canada
> _______________________________________________
> Limdep site list
> Limdep at limdep.itls.usyd.edu.au
> http://limdep.itls.usyd.edu.au