Travel Behavior Symposium
Evanston, Illinois
21 June 2007- 22 June 2007
Hosted By: Northwestern University
NERA Vice President Professor Kenneth Train delivered a presentation at a two-day travel behavior symposium held at Northwestern University on 21-22 June 2007 in honor of Professor Frank Koppelman's retirement from the school's Department of Civil and Environmental Engineering. Professor Train presented a paper, Estimation on Stated-Preference Experiments Constructed from Revealed-Preference Choices, which he co-authored with Professor Wesley W. Wilson of the University of Oregon.
In his presentation, Professor Train described a new way of obtaining information about preferences, pointing out that constructing stated-preference experiments from a choice that the respondent made in a revealed-preference setting can enhance the realism of the stated-preference task and the efficacy of preference revelation. However, the practice creates endogeneity in the attributes of the stated-preference alternatives. Professor Train also described a general estimation method that accounts for the endogeneity and gave specific examples based on standard and mixed logit specifications of the revealed preference choice. In addition, he showed conditions under which standard estimation methods are consistent despite the endogeneity for one type of experimental design. Professor Train concluded by illustrating the more general methodology through an application to shippers' choice of route and mode along the Columbia/Snake River system.
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