On the formulation of time-space prisms to model constraints on personal activity-travel engagement

Ram M. Pendyala, Toshiyuki Yamamoto, Ryuichi Kitamura

Research output: Contribution to journalArticlepeer-review

87 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)73-94
Number of pages22
Issue number1
StatePublished - Feb 2002
Externally publishedYes


  • Activity engagement
  • Prism vertex
  • Time-space constraints
  • Time-space prism
  • Travel behavior
  • stochastic frontier model

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Development
  • Transportation


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