Abstract
When applied to a given interval of time, the Greenwood-Yule accident model provides a valid fit to accident frequency distributions generated by 148,000 motorists in the 1964 California Driver Record Study. However, when distributions are viewed in the light of Kerrich's extension of the Greenwood-Yule model to two time periods, we do not obtain tenable results because of the apparent violations in certain assumptions. Predictive aspects inherent in the model are explored. Model inadequacies are noted and reference is made toward possible improvements.
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