st: nlogit null model log likelihood: will clogit suffice?

[John Fulton <fulton@ssc.wisc.edu>]

Hello statalisters.
I need to get the null-model log likelihood from -nlogit-.
I can't think of a way to do it, because -nlogit's- syntax requires 
nesting information,
as in this example, where the dependent variable (which indicates the 
chosen alternative)
is "chosen," and the group is identified by "group_id":
   . nlogit chosen (nest1=var1) (nest2=var2), group(group_id)

But I don't want the log likelihood with var1 and var2 in the model.

I tried this:
   . nlogit chosen , group(group_id)
   and was told "varlist not allowed"

If I do this:
   . clogit chosen, group(group_id)
   I get the log likelihood of the null model.

Is there any reason this isn't a valid log likelihood for the null -nlogit-?

Thank you.
John.



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