Highlights ► We compared the negative binomial-Lindley model (NB-L) with the negative binomial (NB) and zero-inflated models. ► We used a simulated dataset and two observed datasets to evaluate the performance of the models. ► For the simulated dataset, the NB-L model was able to reproduce the “true” parameter values. ► The NB-L model offers the advantage of being able to handle datasets with a large number of zeros and/or high dispersion. ► The NB-L model provides a superior performance over the NB and zero-inflated models.

    Abstract There has been a considerable amount of work devoted by transportation safety analysts to the development and application of new and innovative models for analyzing crash data. One important characteristic about crash data that has been documented in the literature is related to datasets that contained a large amount of zeros and a long or heavy tail (which creates highly dispersed data). For such datasets, the number of sites where no crash is observed is so large that traditional distributions and regression models, such as the Poisson and Poisson-gamma or negative binomial (NB) models cannot be used efficiently. To overcome this problem, the NB-Lindley (NB-L) distribution has recently been introduced for analyzing count data that are characterized by excess zeros. The objective of this paper is to document the application of a NB generalized linear model with Lindley mixed effects (NB-L GLM) for analyzing traffic crash data. The study objective was accomplished using simulated and observed datasets. The simulated dataset was used to show the general performance of the model. The model was then applied to two datasets based on observed data. One of the dataset was characterized by a large amount of zeros. The NB-L GLM was compared with the NB and zero-inflated models. Overall, the research study shows that the NB-L GLM not only offers superior performance over the NB and zero-inflated models when datasets are characterized by a large number of zeros and a long tail, but also when the crash dataset is highly dispersed.


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    Titel :

    The negative binomial-Lindley generalized linear model: Characteristics and application using crash data


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    2011-07-18


    Format / Umfang :

    8 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





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