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st: Data set up for nlogit and nlogitrum


From   "Prahm, Jeremy" <Jeremy.Prahm@gmacrfc.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Data set up for nlogit and nlogitrum
Date   Tue, 8 Mar 2005 10:32:13 -0600

This question concerns the set up of data for estimation using nlogit
and nlogitrum commands.

Do I need to populate the dataset with observations for all the choices
the individual did not make?  Let "chosen" be the dependent variable, I
only have data for the observations where "chosen" equals 1.  For
example, of possible choices: A, B, C, D, I have an observation that
they selected D and can set the variable "chosen" equal to 1.  Do I need
to generate three more observations where "chosen" takes a value of 0
for choices A, B, and C, thus making my dataset 4 times as large?  My
understanding is that I do, but it doesn't seem to be very efficient
considering I have a very large dataset.  Thanks in advance for any
help.

=====================
Jeremy Prahm

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