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Re: st: nlogit and no within-group variation [Stata 8]


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: nlogit and no within-group variation [Stata 8]
Date   Thu, 23 Jul 2009 12:23:14 +0000 (GMT)

--- On Thu, 23/7/09, Afridi wrote:
>   I read this question on the group homepage. It is
> few years old question. But  i could not find answer
> to this question from anyone here. I will be thankful 
> if someone can give me some direction for such kind
> of case. i  am working to a smilar case and facing
> same problem as stated below.

--- "R.E. De Hoyos" <redeho@...> wrote:
<snip>
> > Given the structure of my data I do NOT have
> > within-group variation. In fact what I want
> > to estimate is a nested logit with -mlogit- 
> > within the branches (in my case a simple
> > -logit-), therefore I shouldn't need outcomes'
> > characteristics (variation withing-groups).
> >
> > Is there anything that I am missing? Or is Stata'a
> > -nlogit- subject to -clogit- within branches?

I think that haveing a variable that changes across outcomes is 
needed for identification of -nlogit- (though I can't find the 
reference). 

What R.E. De Hoyos seems to refer to seems to me a sequential 
logit model, which can be estimated with -seqlogit- which you 
can install by typing: -ssc install seqlogit-

Hope this helps,
Maarten

> PS.  If someone want to reply can write me in person
> on afridisabir@...

This would not be a nice thing to do, because some 
person may now run into the same problem as you did:
find a post where the question was asked, but cannot
find the answer.

-----------------------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


      

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