Modeling road traffic crashes with zero-inflation and site-specific random effects |
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Authors: | Helai Huang Hong Chor Chin |
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Institution: | 1. Department of Civil and Environmental Engineering, University of Central Florida, Orlando, FL, 32826, USA 2. Department of Civil Engineering, National University of Singapore, Engineering Drive 2, EW1-04-02B, Singapore, 117576, Singapore
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Abstract: | Zero-inflated count models are increasingly employed in many fields in case of “zero-inflation”. In modeling road traffic
crashes, it has also shown to be useful in obtaining a better model-fitting when zero crash counts are over-presented. However,
the general specification of zero-inflated model can not account for the multilevel data structure in crash data, which may
be an important source of over-dispersion. This paper examines zero-inflated Poisson regression with site-specific random
effects (REZIP) with comparison to random effect Poisson model and standard zero-inflated poison model. A practical and flexible
procedure, using Bayesian inference with Markov Chain Monte Carlo algorithm and cross-validation predictive density techniques,
is applied for model calibration and suitability assessment. Using crash data in Singapore (1998–2005), the illustrative results
demonstrate that the REZIP model may significantly improve the model-fitting and predictive performance of crash prediction
models. This improvement can contribute to traffic safety management and engineering practices such as countermeasure design
and safety evaluation of traffic treatments. |
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