New publication in Transportation Research Part C

The following paper is now available online:

Nakayama, S., Chikaraishi, M. (2021) Doubly generalized logit: a closed-form discrete choice model system with multivariate generalized extreme value distributed utilities, Transportation Research Part C, Vol. 132, 103315.

Abstract:
In this study, we generalize our previous q-generalized multinomial logit model (Nakayama & Chikaraishi, 2015), in which the heteroscedastic variance and flexible shape of the utility distribution are considered, by allowing for statistical dependency of alternatives. This is achieved by introducing the q-generalization of McFadden’s multivariate Gumbel distribution. Thus, the logit model is doubly generalized; 1) each utility follows the generalized extreme value distribution that includes the Gumbel, Weibull, and Fréchet distributions; and 2) the utility distribution is multivariate, and therefore, a nested or cross-nested structure and dependency of alternatives are allowed. The proposed doubly generalized logit model system allows for deriving new closed-form discrete choice models such as the q-generalized nested logit model and q-generalized cross-nested logit (CNL) model. Furthermore, the model system includes conventional logit models such as the multinomial logit, nested logit, and CNL models as special cases as well as the new generalized logit models, while retaining a closed-form expression. We empirically confirm that the goodness-of-fit of the proposed model could be substantially better compared to that of the conventional models in some cases, though the degree of improvements varies across cases.

https://www.sciencedirect.com/science/article/pii/S0968090X21003235?dgcid=author

Graduation: Maya Safira, Faisal Ali

Congratulations on your graduation, Maya Safira (Doctor course), Faisal Ali (Master course). Dr. Maya Safira is the very first PhD student from our lab. We really appreciate her hard work and efforts. Particularly, she made a great contribution to improving our ability as a team. We will try to keep your meme in our lab. Best wishes for both of your future!

 

Yasoshima Yoshinosuke Prize and Best Paper Award from the EASTS 2021 !

Diana won the Top Prize and Yoshioka won a Best Paper Award from the EASTS2021! Congratulations!

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Yasoshima Yoshinosuke Prize (The Top Prize from all EASTS2021 papers)

Authors: Nur Diana Safitri, Makoto Chikaraishi:
Title: Impact of Transport Network Disruption on Travel Demand: A Case Study of July 2018 Heavy Rain Disaster, Japan

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Best Paper Award for “Discovering interesting facts”

Authors: Taisei YOSHIOKA, Makoto CHIKARAISHI, Akimasa FUJIWARA:
Title: Empirical Models of Consumer and Merchant Behavior in the Two-Sided Market of Local Currency