Publications by Timothy Michael Hillel

Integration of group decision-mechanisms into activity-based models

Michel Bierlaire, Timothy Michael Hillel, Negar Rezvany

2024

Household-level choice-set generation and parameter estimation in activity-based models

Michel Bierlaire, Timothy Michael Hillel, Negar Rezvany

2024

Simulating intra-household interactions for in- and out-of-home activity scheduling

Michel Bierlaire, Timothy Michael Hillel, Negar Rezvany

Various interactions, time arrangements, and constraints exist for individuals scheduling their day as a member of a household, which affect their in-home as well as out-of-home activity schedule. However, the existing activity-based models are mostly base ...

Pergamon-Elsevier Science Ltd2023

OASIS: Optimisation-based Activity Scheduling with Integrated Simultaneous choice dimensions

Michel Bierlaire, Janody Pougala, Timothy Michael Hillel

Activity-based models offer the potential of a far deeper understanding of daily mobility behaviour than trip-based models. However, activity-based models used both in research and practice have often relied on applying sequential choice models between sub ...

2023

Capturing trade-offs between daily scheduling choices

Michel Bierlaire, Janody Pougala, Timothy Michael Hillel

We propose a new modelling approach for daily activity scheduling which integrates the different daily scheduling choice dimensions (activity participation, location, schedule, duration and transportation mode) into a single optimisation problem. The funda ...

ELSEVIER SCI LTD2022

A utility optimization-based framework for joint in- and out-of-home scheduling

Michel Bierlaire, Timothy Michael Hillel, Negar Rezvany

Existing activity-based modeling predominantly focus on out-of-home activities in order to un- derstand transport demand. In this research, we extend the state of practice in activity-based modelling by determining both in- and out-of-home activities in a ...

2022

Representing location choice within activity-based models

Michel Bierlaire, Janody Pougala, Nicolas Jean Salvadé, Timothy Michael Hillel

Since the 70s, there has been a growing interest in activity-based modelling. This approach models the need to travel as a result of performing daily activities (Bowman and Ben-Akiva, 2001). Nevertheless, the activities need to be scheduled which involves ...

2022

Estimating flexibility preferences to resolve temporal scheduling conflicts in activity-based modelling

Michel Bierlaire, Janody Pougala, Timothy Michael Hillel

This paper presents a novel activity-based demand model that combines an optimisation framework for continuous temporal scheduling decisions (i.e. activity timings and durations) with traditional discrete choice models for non-temporal choice dimensions (i ...

SPRINGER2022

A systematic review of machine learning classification methodologies for modelling passenger mode choice

Michel Bierlaire, Ying Jin, Timothy Michael Hillel

Machine Learning (ML) approaches are increasingly being investigated as an alternative to Random Utility Models (RUMs) for modelling passenger mode choice. These approaches have the potential to provide valuable insights into choice modelling research ques ...

ELSEVIER SCI LTD2021

Assisted specification of discrete choice models

Michel Bierlaire, Nicola Marco Ortelli, Timothy Michael Hillel

Determining appropriate utility specifications for discrete choice models is time-consuming and prone to errors. With the availability of larger and larger datasets, as the number of possible specifications exponentially grows with the number of variables ...

ELSEVIER SCI LTD2021

Estimation of discrete choice models with hybrid stochastic adaptive batch size algorithms

Michel Bierlaire, Gael Lederrey, Virginie Janine Camille Lurkin, Timothy Michael Hillel

The emergence of Big Data has enabled new research perspectives in the discrete choice community. While the techniques to estimate Machine Learning models on a massive amount of data are well established, these have not yet been fully explored for the esti ...

2021

Modelling mobility tool availability at a household and individual level; A case study of Switzerland

Michel Bierlaire, Janody Pougala, Timothy Michael Hillel

2020

An optimization framework for daily activity schedules

Michel Bierlaire, Janody Pougala, Timothy Michael Hillel

2020

An Early Stopping Bayesian Data Assimilation Approach for improved Mixed Multinomial Logit transferability

Timothy Michael Hillel

EPFL2020

Stochastic Optimization with Adaptive Batch Size: Discrete Choice Models as a Case Study

Michel Bierlaire, Gael Lederrey, Virginie Janine Camille Lurkin, Timothy Michael Hillel

The 2.5 quintillion bytes of data created each day brings new opportunities, but also new stimulating challenges for the discrete choice community. Opportunities because more and more new and larger data sets will undoubtedly become available in the future ...

2019

Weak teachers: assisted specification of discrete choice models using ensemble learning algorithms

Timothy Michael Hillel

Discrete Choice Models (DCMs) have a distinct advantage over Machine Learning (ML) classification algorithms, in that they employ a highly interpretable linear structure. However, a key drawback of DCMs compared to ML is the need to specify the utility fun ...

2019