Modeling endogeneity between motorcyclist injury severity and at-fault status by applying a Bayesian simultaneous random-parameters model with a recursive structure

IF 12.5 1区 工程技术 Q1 PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH
Fangrong Chang , Shamsunnahar Yasmin , Helai Huang , Alan H.S. Chan , Md. Mazharul Haque
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引用次数: 4

Abstract

Motorcyclists’ at-fault status is an important factor influencing crash injury severity in that intrinsically unsafe riders tend to be at fault and are the ones likely to be involved in severe crashes. However, this endogeneity issue and its influence on model estimations have seldom been investigated with regard to motorcyclist crash severity analysis. This study proposes a simultaneous model system to account for the endogenous effects of at-fault status in the motorcyclists’ injury severity analysis. Four Bayesian simultaneous models were developed using motorcyclist crash injury data from Queensland, Australia, from the year 2017 through 2018, including an independent binary and independent ordered Probit model, a simultaneous binary-ordered Probit model without recursive structure, a simultaneous binary-ordered Probit model with a recursive structure, and a simultaneous random-parameters binary-ordered Probit model with a recursive structure. The results of all simultaneous models indicate the existence of endogeneity associated with at-fault status in the injury outcome analysis. In particular, the endogenous relationship is detected by the significant cross-equation correlations in the simultaneous models. The model comparison by Deviance Information Criteria highlights the superiority of the simultaneous random-parameters model with a recursive structure. It was found that exogenous variables such as traffic sign-controlled measures, posted speed limits of 100–110 km/h, the presence of vertical grades, rider age 16–24 years, and unlicensed influenced injury severity indirectly through at-fault status, and ignoring these indirect influences could result in biased estimates. The presence of random parameters, such as collisions with heavy vehicles and riders over 59 years, highlights the importance of considering heterogeneity. The simultaneous random-parameters model with a recursive structure model revealed that the critical factors contributing to riders’ at-fault status included unlicensed riders and posted speed limits of 100–110 km/h, and the crucial factors influencing riders’ injury levels included head-on crashes, collisions with heavy vehicles, darkness-unlighted, and riders over 59 years old. The proposed model system demonstrates the importance of considering both endogeneity and heterogeneity for modeling the injury severity of motorcyclists.

基于递归结构贝叶斯同步随机参数模型的摩托车损伤严重程度与故障状态内生性建模
摩托车手的过错状态是影响碰撞伤害严重程度的一个重要因素,因为本质不安全的摩托车手往往是有过错的,并且是可能参与严重碰撞的人。然而,这种内生性问题及其对模型估计的影响很少在摩托车碰撞严重程度分析方面进行研究。本研究提出了一个同步模型系统来解释摩托车手损伤严重程度分析中过错状态的内生效应。利用2017 - 2018年澳大利亚昆士兰州摩托车碰撞损伤数据,建立了4个贝叶斯同步模型,包括独立二元和独立有序Probit模型、不含递归结构的同步二元有序Probit模型、带递归结构的同步二元有序Probit模型和带递归结构的同步随机参数二元有序Probit模型。所有同步模型的结果表明,在损伤结果分析中存在与过错状态相关的内生性。特别是,内生关系通过同时模型中显著的交叉方程相关性来检测。通过偏差信息准则对模型的比较,突出了具有递归结构的同时随机参数模型的优越性。研究发现,外生变量,如交通标志控制措施、张贴的100-110公里/小时的速度限制、垂直等级的存在、骑乘者年龄16-24岁和无证驾驶等,通过故障状态间接影响伤害严重程度,忽略这些间接影响可能导致有偏差的估计。随机参数的存在,例如与重型车辆和超过59年的乘客的碰撞,突出了考虑异质性的重要性。基于递归结构模型的同步随机参数模型表明,影响骑手过失状态的关键因素包括无牌骑手和限速100 ~ 110 km/h,影响骑手伤害水平的关键因素包括正面碰撞、与重型车辆碰撞、黑暗未亮灯和年龄大于59岁的骑手。所提出的模型系统表明,考虑内生性和异质性的重要性建模的伤害严重的摩托车手。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
22.10
自引率
34.10%
发文量
35
审稿时长
24 days
期刊介绍: Analytic Methods in Accident Research is a journal that publishes articles related to the development and application of advanced statistical and econometric methods in studying vehicle crashes and other accidents. The journal aims to demonstrate how these innovative approaches can provide new insights into the factors influencing the occurrence and severity of accidents, thereby offering guidance for implementing appropriate preventive measures. While the journal primarily focuses on the analytic approach, it also accepts articles covering various aspects of transportation safety (such as road, pedestrian, air, rail, and water safety), construction safety, and other areas where human behavior, machine failures, or system failures lead to property damage or bodily harm.
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