Name: What happens when smartphone GPS data fails? Reconstructing lost travel sequences in 7-day diaries using subsequence pattern mining algorithm
Start: 2025-05-26T14:30:00-0400
End: 2025-05-26T14:50:00-0400

Welcome to CTRF’s 60th Annual Conference! Enjoy Ottawa

Monday May 26, 2025 2:30pm - 2:50pm EDT

Desmarais 3105

Comprehensive 7-day data is crucial for capturing full spectrum of weekly and weekend travel behaviors which is often overlooked in single-day surveys. Direct methods like web-based surveys face challenges such as survey fatigue, biased responses, and data quality issues while collecting 7-day data. Passive data collection methods such as smartphone apps with GPS tracking offer an alternative, reducing respondent burden while providing detailed spatiotemporal data. However, GPS-based methods are not without limitations, including inaccuracies, app closures due to battery optimization, and missing data caused by user behavior or permission restrictions. The study uses a dataset from the British Columbia Activity Time-Use Survey (BC ATUS) which combines a 1-day web-based activity diary with a subset of 7-day smartphone app trip diary data. While the app data provides valuable insights, it is often incomplete, with missing trips and activity durations. To address this problem, this study employs a sequence of econometric and machine learning models to impute missing values by incorporating socio-demographic attributes, temporal patterns, and activity characteristics. This approach improves data completeness while addressing cost and quality concerns in 7-day smartphone data collection. By overcoming these challenges, our method supports more accurate travel behavior modeling and informed transportation policy decisions.

Speakers

Imrul Kayes Shafie

University of British Columbia, Okanagan

Mahmudur Fatmi

Assistant Professor, University of British Columbia - Okanagan

Dr. Mahmudur Fatmi is a transportation professor at UBCO. He has started as an assistant professor at UBCO since July 2018. Dr. Fatmi contributes by developing advanced econometric modelling methods and agent-based microsimulation modelling techniques to assist in making effective... Read More →

45. Shafie Paper CTRF2025 pdf

Monday May 26, 2025 2:30pm - 2:50pm EDT
Desmarais 3105 55 Laurier Ave E, Ottawa ON K1N 6N5

Statistics & data issues

CTRF 2025

Imrul Kayes Shafie

Mahmudur Fatmi

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