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Temporal Sampling Intervals and Service Frequency Harmonics in Transit Accessibility Evaluation

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Abstract

In the context of public transit networks, repeated calculation of accessibility at multiple departure times provides a more robust representation of local accessibility. However, these calculations can require significant amounts of time and/or computing power. One way to reduce these requirements is to calculate accessibility only for a sample of time points over a time window of interest, rather than every one. To date, many accessibility evaluation project have employed temporal sampling strategies, but the effects of different strategies have not been investigated and their performance has not been compared. Using detailed block-level accessibility calculated at 1-minute intervals as a reference dataset, four different temporal sampling strategies are evaluated. Systematic sampling at a regular interval performs well on average but is susceptible to spatially-clustered harmonic error effects which may bias aggregate accessibility results. A constrained random walk sampling strategy provides slightly worse average sample error, but eliminates the risk of harmonic error effects.

Suggested Citation

  • Andrew Owen & Haibing Jiang, 2015. "Temporal Sampling Intervals and Service Frequency Harmonics in Transit Accessibility Evaluation," Working Papers 000144, University of Minnesota: Nexus Research Group.
    • Handle: RePEc:nex:wpaper:accessibilitysampling
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    File URL: http://nexus.umn.edu/Papers/AccessibilitySampling.pdf
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    References listed on IDEAS

    as
    1. Owen, Andrew & Levinson, David M., 2015. "Modeling the commute mode share of transit using continuous accessibility to jobs," Transportation Research Part A: Policy and Practice, Elsevier, vol. 74(C), pages 110-122.
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    More about this item

    Keywords

    Accessibility; Sampling Strategies; Public Transport;
    All these keywords.

    JEL classification:

    • C14 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Semiparametric and Nonparametric Methods: General
    • R40 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - Transportation Economics - - - General

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