[Limdep Nlogit List] Nlogit without differing attributes

[Kandice L. Kleiber]

Hi -

I'm trying to set up a nested logit.  My data, however, does not  
contain any variables that differ across choices.  My tree = cs (corn,  
soy), wheat, other.  The NLogit manual provides examples where some  
variables differ across choices, however this set-up doesn't work when  
all of the variables have the same value across differing choices.

Is it reasonable to set up the model excluding the choices that I want  
to normalize on?  For example, if I set up my model following the  
NLogit manual, I would have:
Model:
U(corn)
U(soy)
U(cs)
U(wheat)
U(other)

Since my variables do not vary across choices, can I instead set up  
like:
Model:
U(corn)
U(cs)
U(wheat)

Thus normalizing on the lower level with soy, and on the upper level  
with other.

Any input is appreciated.  Thank you!
Kandice.

---
Kandice L. Kleiber
Graduate Teaching Assistant
Department of Economics
Oregon State University
e: kleiberk at onid.orst.edu
w: 541.737.6628