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Accid Anal Prev. 2009 Jan;41(1):153-9. doi: 10.1016/j.aap.2008.10.005. Epub 2008 Nov 7.

A note on modeling vehicle accident frequencies with random-parameters count models.

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  • 1School of Civil Engineering, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907-2051, USA.


In recent years there have been numerous studies that have sought to understand the factors that determine the frequency of accidents on roadway segments over some period of time, using count data models and their variants (negative binomial and zero-inflated models). This study seeks to explore the use of random-parameters count models as another methodological alternative in analyzing accident frequencies. The empirical results show that random-parameters count models have the potential to provide a fuller understanding of the factors determining accident frequencies.

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