Application of different negative binomial parameterizations to develop safety performance functions for non-federal aid system roads

This study examined the application of traditional negative binomial and zero-favored negative binomial models (i.e., negative binomial-Lindley). Both groups of models were formulated by different variance and dispersion structures. Using crash, roadway inventory, and traffic volume data from 2014 to 2018 in Virginia, the results showed that the NB-L models perform better than the traditional NB models. Furthermore, an appropriate variance structure along with a reasonably chosen dispersion function can further improve the model performance.PMID:33866155 | DOI:10.1016/j.aap.2021.106103
Source: Accident; Analysis and Prevention. - Category: Accident Prevention Authors: Source Type: research