Article ID Journal Published Year Pages File Type
572953 Accident Analysis & Prevention 2010 8 Pages PDF
Abstract

We consider zero-inflated Poisson and zero-inflated negative binomial regression models to analyze discrete count data containing a considerable amount of zero observations. Analysis of current data could be empirically feasible if we utilize similar data based on previous studies. Ibrahim and Chen (2000) proposed the power prior to incorporate certain information from the historical data available from previous studies. The power prior is constructed by raising the likelihood function of the historical data to the power a0,a0, where 0≤a0≤10≤a0≤1. The power prior is a useful informative prior in Bayesian inference. We estimate regression coefficients associated with several safety countermeasures. We use Markov chain and Monte Carlo techniques to execute some computations. The empirical results show that the zero-inflated models with the power prior perform better than the frequentist approach.

Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Health and Safety
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