Colleagues
This is to remind you of the next CTS seminar at UCL, which will be given
by our academic visitor Prof Juan de Dios Ortuzar. The topic will be
Discrete choice modelling with latent variables: some new findings.
We hope that you will be able to join us for this.
Ben
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Centre for Transport Studies
University College London
Seminar
20 May 2009
16.00 Pearson Lecture Theatre
UCL
Discrete choice modelling with latent variables: some new findings
Juan de Dios Ortúzar
Honorary Senior Research Associate
Centre for Transport Studies, UCL
Abstract
The formulation of hybrid discrete choice models, including both tangible
alternative attributes and latent variables associated with attitudes and
perceptions has been a major topic of discussion in recent years. To
estimate models with both kinds of variables, two methods have been
developed: the sequential approach, where the latent variables are built
before their integration with the traditional explanatory variables in the
choice model, and the simultaneous approach, where both process are
undertaken together. The latter method has seen very few applications
due to the complexity associated to its estimation.
In this paper we compare the results obtained using both approaches for
an urban modal choice context with several modes; we found striking
differences that had not been found in earlier studies.
Professor Juan de Dios Ortúzar is currently
visiting the Centre for Transport Studies.
He is Head of the Department of Transport
Engineering and Logistics at the Catholic
University of Chile in Santiago, where he has
been a full-time academic since 1972.
His research interests include
discrete choice modelling techniques and their application to
determine willingness-to-pay for reducing transport externalities
such as accidents, noise and atmospheric pollution.
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___________________________________________________________________________
Benjamin Heydecker
Professor of Transport Studies
Centre for Transport Studies
University College London
Gower Street
LONDON WC1E 6BT
England
Phone: 020-7679 1553
Fax: 020-7679 1567
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www.cts.ucl.ac.uk
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