A Mixed Joint Discrete-Continuous Model of Non-Mandatory Out-of-Home Activity Type and Activity Duration
Discrete-continuous joint modeling techniques have been widely used in travel behavior analysis to investigate casual relationship between a discrete choice and its continuous outcome. Recently, copula-based discrete-continuous joint models have well established their application in travel demand modeling, thanks to their flexible and non-restrictive dependency structure. The copula parameter underlines the existence of a significant unobserved component that affects both the discrete decision and the continuous outcome. This study extends previous efforts on copula-based joint modeling by incorporating unobserved heterogeneity into a copula-based discrete-continuous joint modeling framework. It examines two scenarios: 1) incorporating unobserved heterogeneity into marginal distributions; and 2) incorporating unobserved heterogeneity into copula parameter. Mixed and non-mixed copula models are developed and examined for weekday non-mandatory out-of-home activity type choice as the discrete decision and episode duration as the continuous variable. The focus of the study is on weekday non-mandatory out-of-home activities. The data used for the purpose of this study comprise 5,000 randomly selected trip-activity observations from the Chicago Metropolitan Agency for Planning (CMAP) Travel Tracker Survey collected in the Greater Chicago Area in 2007-2008. The results indicate that the mixed Frank model with incorporated unobserved heterogeneity outperforms other non-mixed and mixed copula models. Also, estimated copula parameter indicates a strong negative relationship between error terms of discrete choice and its continuous outcome.
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Supplemental Notes:
- This paper was sponsored by TRB committee ADB10 Traveler Behavior and Values.
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Corporate Authors:
500 Fifth Street, NW
Washington, DC United States 20001 -
Authors:
- Karimi, Behzad
- Pourabdollahi, Zahra
- Anbarani, Ramin Shabanpour
- Mohammadian, Abolfazl (Kouros)
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Conference:
- Transportation Research Board 94th Annual Meeting
- Location: Washington DC, United States
- Date: 2015-1-11 to 2015-1-15
- Date: 2015
Language
- English
Media Info
- Media Type: Digital/other
- Features: Figures; References; Tables;
- Pagination: 18p
- Monograph Title: TRB 94th Annual Meeting Compendium of Papers
Subject/Index Terms
- TRT Terms: Activity choices; Travel behavior; Travel demand; Travel surveys
- Candidate Terms: Copula-based models
- Identifier Terms: Chicago Metropolitan Agency for Planning
- Uncontrolled Terms: Discrete-continuous models; Heterogeneity (Models)
- Geographic Terms: Chicago Metropolitan Area
- Subject Areas: Highways; Planning and Forecasting; Public Transportation; I72: Traffic and Transport Planning;
Filing Info
- Accession Number: 01556578
- Record Type: Publication
- Report/Paper Numbers: 15-2261
- Files: TRIS, TRB, ATRI
- Created Date: Mar 9 2015 4:56PM