On the formulation of time-space prisms to model constraints on personal activity-travel engagement |
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Authors: | Pendyala Ram M. Yamamoto Toshiyuki Kitamura Ryuichi |
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Affiliation: | (1) Department of Civil and Environmental Engineering, University of South Florida, 4202 E. Fowler Avenue, ENB 118, Tampa, FL 33620-5350, USA;(2) Department of Civil Engineering Systems, Faculty of Engineering, Kyoto University, Sakyo-ku, Kyoto, 606, Japan |
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Abstract: | The notion of time-space prisms has often been used in the context of describing activity-travel patterns of individuals. This paper presents a methodology for estimating the temporal vertices of time-space prisms using the stochastic frontier modeling technique. Observed trip starting and ending times are used as dependent variables and socio-economic characteristics and commute characteristics serve as independent variables. The models are found to offer plausible results indicating that temporal vertices of time-space prisms, though unobservable, can be estimated based on temporal characteristics of observed activity-travel patterns. Comparisons of stochastic frontier models of prism vertices and the distributions of prism vertices are presented using two activity data sets collected in the United States – San Francisco and Miami. Differences and similarities in temporal vertex locations are highlighted in the paper. |
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Keywords: | activity engagement prism vertex stochastic frontier model time-space constraints time-space prism travel behavior |
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