Professor Koppelman's research is focused on the analysis and prediction of personal travel behavior based on the development of activity-based travel demand models for urban travel and multi-dimensional choice models for intercity travel and air traveler preferences for carriers, schedule and classes.. His research includes development of extended logit choice models which allow flexible patterns of substitution and differences among individuals and travel contexts and their application to complex choice problems.
Selected publications are accessible by selecting the following subject titles:
Activity-Based Travel
Demand Models
(11 papers are listed under this topic)
Urban travel research has shifted to a structure based primarily on the role
of travel in providing access to activity locations to satisfy household needs
for participation in work, household maintenance, social/recreational and other
activities.
Extended Logit Discrete
Choice Models
(7 papers are listed under this topic)
Random utility maximization discrete choice models are widely used in transportation
and other fields to represent the choice of one among a set of mutually exclusive
alternatives. Early development of choice models was based on simplifying assumptions
which led to the widely used multinomial logit but limited the ability to represent
the structure of the choice process. This research contributes to the
development of closed form models which relax the assumption of the multinomial
logit model to provide a more realistic representation of choice probabilities
within a closed form framework.
Urban Travel Demand
(4 papers are listed under this topic)
Traditional urban travel demand models have been enhanced through the use of
disaggregate data, attitudinal measures and discrete choice models.
Intercity Travel Demand
(7 papers are listed under this topic)
The choice of intercity travel mode is important to the assessment of investment
in new roadways, intercity rail and high speed rail services and intercity air
terminals and service. These models reflect the complexity of the intercity
travel decision.
Air Traveler Preferences
(8 papers are listed under this topic)
Intercity air travelers face a myriad of choices including choice of carrier,
time of day, day of week and class of service. This research examines
issues important to travelers in choosing alternatives along these dimension
and addresses the response of travelers to the inability to book their preferred
alternative.