Dear all,
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.
Many thanks.
kind regards
Muhammad Sabir,
PhD Researcher
VU Univeristy, Amsterdam
The Netherlands.
Email: [email protected]
PS. If someone want to reply can write me in person on
[email protected]
--- In [email protected], "R.E. De Hoyos" <redeho@...> wrote:
>
> [Stata 8]
>
> I am trying to estimate a nested logit using firm-level data. My
dependent
> variable (recaso1) takes three values {1,2,3}.
>
> I nested outcomes 2 and 3 into the same group (IIA and "collapsing"
test
> suggested this).
> I have information about the firms' characteristics (and these are the
> explanatory var) but not about the outcome's characteristics.
Following
> Stata manual's instructions I -reshape-d the data (from wide to long)
to
> create a firm's id and the dichotomous variable coded as 0 for not
selected
> alternatives and 1 for the selected alternative and I set the data:
>
> gen fid = _n
> tab recaso1, gen(recaso_b)
> reshape long recaso_b, i(fid) j(wfid)
> nlogitgen resolution = recaso1(allow: Allowed, notallow: Conditioned |
> Changed)
> nlogittree recaso1 resolution
>
> resolution recaso1
> --------------------------
> allow Allowed
> notallow Conditioned
> Challenged
>
> The following occurs when estimating the model:
>
> nlogit recaso_b (recaso1 = ihh ext colusion) (resolution = ihh hist
rela syn
> imp eb2), group(fid)
>
> tree structure specified for the nested logit model
>
> top --> bottom
>
> resolution recaso1
> --------------------------
> allow Allowed
> notallow Conditioned
> Challenged
> note: ihh omitted due to no within-group variance
> note: ext omitted due to no within-group variance
> note: colusion omitted due to no within-group variance
> no independent variables for recaso1 model
> r(102);
>
>
> 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?
>
> Thanks,
>
> Rafa
>
> ________________________
> R.E. De Hoyos
> Faculty of Economics
> University of Cambridge
> CB3 9DE, UK
> www.econ.cam.ac.uk/phd/red29/
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
