Re: st: Estimating MNL model

[Richard Williams <richardwilliams.ndu@gmail.com>]

At 04:57 PM 10/11/2013, Nabin Kafle wrote:
> I have a data set which has four choices, people choosing between car,
> rail, auto and air. The choice of an alternate is affected by the
> availability of the alternate (if air, rail, bus and car is available
> to them or not), travel time and travel cost and age of the person. I
> need to estimate the utility function for a person for choosing each
> alternate. I could do it using biogeme but I am not sure how to do it
> in stata.
I would get the Long and Freese book.  But see also

http://rt.uits.iu.edu/visualization/analytics/docs/cdvm-docs/cdvm7.php

http://data.princeton.edu/wws509/stata/c6s3.html

http://userwww.service.emory.edu/~poldd/clogit.pdf

http://www.philender.com/courses/categorical/notes2/clogit.html

Also look at the asclogit command. I can't vouch for the above 
sources but they seem to be talking about the sorts of things you want.

> The utility function would be
> Vi,bus= constant+ B1*time+ B2*cost (assuming this is the base choice)
> Vi, car= constant + B3*time + B4*cost + B5* age
> Vi, air = constant + B6* time + B7* cost + B8*age
> Vi, rail = constant + B9* time + B10* cost + B11* age
>
> On Fri, Oct 11, 2013 at 4:15 PM, Richard Williams
> <richardwilliams.ndu@gmail.com> wrote:
> > Like Maarten, I am not totally sure what you want. But, Long and Freese do
> > have an entire chapter on "Models for nominal outcomes with alternative
> > specific data." Among other things they talk about the clogit command. They
> > also describe various utilities for setting the data up and 
> interpreting the
> > results.
> >
> > For more, see
> >
> > 
> http://www.stata.com/bookstore/regression-models-categorical-dependent-variables/
> >
> > See especially chapter 7 and maybe chapter 6. My best guess is that you
> > especially want
> >
> > 7.2.5 Using clogit with case- and alternative-specific variables
> >
> >
> > If you type -findit spost9- you can get the programs used in the book.
> >
> > If this isn't the sort of thing you are looking for, then please provide
> > additional details.
> >
> > As a sidelight I have read various descriptions of the clogit command --
> > Long & Freese's, and using clogit for fixed effects models -- and 
> it sort of
> > amazes me that they are talking about the same command, as the uses seem
> > radically different.
> >
> >
> > At 11:23 AM 10/11/2013, Nabin Kafle wrote:
> >>
> >> How can I estimate MNL moedl in stata with alternate specific and
> >> generic variables. What would be the command to describe them and run
> >> the model. Thanks in advance
> >>
> >> --
> >> Nabin Kafle
> >> *
> >> *   For searches and help try:
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> >> *   http://www.ats.ucla.edu/stat/stata/
> >
> >
> > -------------------------------------------
> > Richard Williams, Notre Dame Dept of Sociology
> > OFFICE: (574)631-6668, (574)631-6463
> > HOME:   (574)289-5227
> > EMAIL:  Richard.A.Williams.5@ND.Edu
> > WWW:    http://www.nd.edu/~rwilliam
> >
> >
> > *
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>
>
>
> --
> Nabin Kafle
> *
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> *   http://www.ats.ucla.edu/stat/stata/
-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME:   (574)289-5227
EMAIL:  Richard.A.Williams.5@ND.Edu
WWW:    http://www.nd.edu/~rwilliam

*
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