Causation analysis of ship accident severity based on ordered choice model

doi:10.16265/j.cnki.issn1003-3033.2023.12.0245

Abstract

Abstract:

In order to explore the factors that affect the severity of ship accidents, a ship accident analysis method based on an ordered choice model was put forward. Firstly, based on 604 investigation reports of ship accidents in coastal waters issued on the official website of the China Maritime Safety Administration and its direct subordinate organizations, as the dependent variable, the severity of ship accidents was divided into minor accidents, general accidents, and larger and above accidents. Secondly, from five aspects of ship, environment, crew, management, and accident, 19 potential influencing factors were selected. Thirdly, the ordered choice model (including the ordered Logit model and ordered Probit model) was utilized to identify the significant factors affecting the severity of ship accidents. In addition, the marginal effect of the best model was used to quantify the influence direction and degree of significant factors on the severity of ship accidents. The findings indicate that the significant influencing factors identified by the two ordered models are the same, including ship operation status, strong wind, failure to adopt safe speed, improper hazard judgment, improper use of navigation equipment, insufficient staffing, inadequate safety management, autumn, winter, coastal routes, collision, and self-sinking. All the significant influencing factors meet the parallel line hypothesis. The fitting effect of the ordered Probit model is better than that of the ordered Logit model. All the significant influencing factors have a positive effect on larger and above ship accidents. In terms of impact degree, collision is the largest (the absolute value of the marginal effect is 20.44%), and improper hazard judgment is the smallest (4.94%).

Key words: ship accidents, accident severity, causation analysis, ordered choice model, marginal effect

JIANG Yujie, WAN Zheng, CHEN Jihong. Causation analysis of ship accident severity based on ordered choice model[J]. China Safety Science Journal, 2023, 33(12): 131-139.

Figures/Tables 5

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类别	变量	变量取值与编码	频数
船舶因素	船型	1=干货船,2=液货船,3=渔船,4=其他	548, 83, 190, 76
船舶因素	船舶状态	1=航行,2=停泊,3=作业	696, 80, 121
环境因素	强风	0=否,1=是	764, 133
	能见度不良	0=否,1=是	764, 134
	通航环境复杂	0=否,1=是	247, 650
船员因素	避碰行动不当	0=否,1=是	670, 227
	瞭望不当	0=否,1=是	390, 507
	未采取安全航速	0=否,1=是	673, 224
	危险判断不当	0=否,1=是	501, 396
	导航设备使用不当	0=否,1=是	616, 281
管理因素	船舶证书不全或无效	0=否,1=是	773, 124
	技能经验不足	0=否,1=是	743, 154
	配员不足	0=否,1=是	576, 321
	安全管理不到位	0=否,1=是	727, 170
	安全意识淡薄	0=否,1=是	723, 174
事故因素	事发季节	1=春季,2=夏季,3=秋季,4=冬季	267, 184, 228, 218
	事发时段	0=夜间,1=白天	602, 295
	事发地点	1=沿海航路,2=港口航道,3=停泊水域	483, 246, 168
	事故类型	1=碰撞,2=自沉,3=其他	586, 103, 208

事故类型	虚拟变量1	虚拟变量2	虚拟变量3
干货船	1	0	0
液货船	0	1	0
渔船	0	0	1
其他	0	0	0

类别	变量	容差	方差膨胀因子
船舶	船型	0.846	1.182
船舶	船舶状态	0.676	1.480
环境	强风	0.796	1.256
	能见度不良	0.919	1.088
	通航环境复杂	0.934	1.070
船员	避碰行动不当	0.809	1.237
	瞭望不当	0.481	2.080
	未采取安全航速	0.777	1.288
	危险判断不当	0.881	1.135
	导航设备使用不当	0.678	1.475
管理	船舶证书不全或无效	0.767	1.304
	技能经验不足	0.768	1.302
	配员不足	0.659	1.517
	安全管理不到位	0.828	1.208
	安全意识淡薄	0.894	1.118
事故	事发季节	0.966	1.035
	事发时段	0.921	1.086
	事发地点	0.741	1.350
	事故类型	0.494	2.026

特征因素	变量	变量取值	参考类别	有序Logit模型		有序Probit模型
特征因素	变量	变量取值	参考类别	参数估计	P值	参数估计	P值
船舶	船舶类型	干货船	其他	-0.050	0.836	-0.051	0.720
		液货船		0.042	0.895	-0.009	0.961
		渔船		0.035	0.904	-0.011	0.946
	船舶状态	航行	停泊	0.055	0.835	0.047	0.758
	船舶状态	作业	停泊	0.513	0.097	0.302	0.094
环境	强风	是	否	0.606	0.005	0.348	0.006
	能见度不良	是	否	0.080	0.672	0.057	0.617
	通航环境复杂	是	否	0.121	0.445	0.087	0.343
船员	避碰行动不当	是	否	0.217	0.197	0.138	0.165
	瞭望不当	是	否	-0.182	0.366	-0.111	0.338
	未采取安全航速	是	否	0.374	0.030	0.219	0.030
	危险判断不当	是	否	0.273	0.052	0.160	0.054
	导航设备使用不当	是	否	0.469	0.007	0.278	0.006
管理	船舶证书不全或无效	是	否	-0.044	0.842	-0.038	0.765
	技能经验不足	是	否	-0.127	0.533	-0.091	0.443
	配员不足	是	否	0.484	0.005	0.299	0.003
	安全管理不到位	是	否	0.774	0.000	0.464	0.000
	安全意识淡薄	是	否	0.203	0.251	0.098	0.342
事故	事发季节	夏季	春季	0.081	0.674	0.054	0.636
		秋季		0.439	0.017	0.268	0.013
		冬季		0.429	0.018	0.254	0.017
	事发时段	白天	夜间	0.019	0.897	0.026	0.763
	事发地点	沿海航路	港口航道	0.672	0.000	0.390	0.000
	事发地点	停泊水域	港口航道	0.249	0.300	0.130	0.354
	事故类型	碰撞	其他	1.245	0.000	0.707	0.000
	事故类型	自沉	其他	1.039	0.000	0.621	0.000
分割点1		μ₁		1.032	—	0.589	—
分割点2		μ₂		3.764	—	2.214	—
平行线检验				卡方值=31.09, P值=0.225		卡方值=31.64, P值=0.205
似然比检验				卡方值=177.06, P值=0.000		卡方值=177.83, P值=0.000
拟合优度检验				赤池信息量准则=1 708.338, 贝叶斯信息准则=1 842.712		赤池信息量准则=1 687.136, 贝叶斯信息准则=1 754.323

特征因素	变量	取值	小事故		一般事故		较大以上事故
特征因素	变量	取值	边际值/%	P值	边际值/%	P值	边际值/%	P值
船舶	船舶状态	作业	-7.488	0.020	-0.87	0.110	8.35	0.020
环境	强风	是	-9.598	0.003	-1.11	0.077	10.71	0.003
船员	未采取安全航速	是	-5.994	0.017	-0.69	0.101	6.69	0.017
	危险判断不当	是	-4.428	0.032	-0.51	0.119	4.94	0.032
	导航设备使用不当	是	-5.875	0.012	-0.68	0.089	6.55	0.011
管理	配员不足	是	-6.620	0.003	-0.77	0.070	7.38	0.002
管理	安全管理不到位	是	-12.476	0.000	-1.44	0.044	13.92	0.000
事故	事发季节	秋季	-6.480	0.008	-0.75	0.085	7.23	0.008
	事发季节	冬季	-5.836	0.017	-0.67	0.104	6.51	0.017
	事发地点	沿海航路	-8.906	0.000	-1.03	0.049	9.93	0.000
	事故类型	碰撞	-18.321	0.000	-2.12	0.044	20.44	0.000
	事故类型	自沉	-15.017	0.000	-1.74	0.062	16.75	0.000