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st: clogit marginal effects?


From   "James Marton" <marton@uky.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: clogit marginal effects?
Date   Mon, 28 Aug 2006 12:38:02 -0400

Hello Everyone

I am trying to estimate marginal effects for a conditional logit model that
is essentially identical to the one presented as example 5 on page 227 in
the STATA 9 reference for A-J under the clogit command.  In that example,
each person chooses between 3 types of cars: American (excluded category),
Japanese, and European.  Their choice depends on their sex and income (both
person specific) and also the number of car dealerships of each type in
their city (person & choice specific).  The dataset is available at: 

http://www.stata-press.com/data/r9/choice.dta

Does anyone know how to generate a set of marginal effects for each person
specific variable?  In other words, after running the clogit model whose
output is given on page 228, I would like to put together a table with the
following information:

Variable	Marginal Effect

Female	marginal effect for choosing American if female
		marginal effect for choosing Japanese if female
		marginal effect for choosing European if female

Income	marginal effect for choosing American if income inc. by 1 unit
		marginal effect for choosing Japanese if income inc. by 1
unit
		marginal effect for choosing European if income inc. by 1
unit

Here the marginal effects for female should sum to one and the marginal
effects for income should sum to one.

Any suggestions would be greatly appreciated!

Jim Marton
Assistant Professor
Martin School of Public Policy and Administration University of Kentucky
marton@uky.edu 
http://www-martin.uky.edu/~marton




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