Abstract Before-and-after safety studies are becoming more desirable in lieu of traditional cross-sectional studies in establishing crash modification factors, especially after the introduction of the first version of the Highway Safety Manual (2010). We present a simple method for estimating necessary sample sizes to obtain a target precision or power when the effect is represented as a proportional change in a Poisson rate. We also show that necessary sample sizes are not very different when full Bayesian models are implemented.


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    Titel :

    Planning sample sizes for before–after accident comparisons


    Beteiligte:
    Sando, Thobias (Autor:in) / Mohr, Donna (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2011-08-17


    Format / Umfang :

    2 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






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