Predicting Severity and Duration of Road Traffic Accident

Table 2

Estimation results of severity prediction models.

Variables	Fatality model			Injury model			Property damage model
	SVM	Ordered Probit		SVM	Ordered Probit		SVM	Ordered Probit
		Coef.	Z-stat.		Coef.	Z-stat.		Coef.	Z-stat.
Dvi	—	—	—	—	—	—	√	0.23	1.99
Bi	√	0.75	8.82	√	0.28	4.37	—	—	—
Ti	√	0.64	7.93	√	0.29	4.61	—	—	—
Di	—	—	—	—	—	—	√	0.11	2.00
Hmi	√	0.04	1.34	√	0.04	1.65	√	0.21	1.96
Tod	√	0.12	2.94	√	0.04	1.21	—	—	—
Wc	√	0.12	2.3	√	−0.05	−2.3	√	0.04	2.46
Vd	—	—	—	—	—	—	√	0.10	5.92
Tsc	√	0.03	2.31	√	−0.02	−1.56	—	—	—
Alh	√	−0.03	−1.44	√	0.04	2.71	√	−0.03	−2.12
Alv	√	−0.11	−6.88	√	0.06	5	√	−0.13	−12.16
Rsc	—	—	—	√	0.11	4.03	—	—	—
Rg	√	−0.26	−1.71	—	—	—	√	−0.18	−2.01
Pc	—	—	—	—	—	—	√	−0.18	−2.09
Vf	√	0.73	7.70	—	—	—	√	0.13	1.98
Vr	√	0.04	1.32	—	—	—	—	—	—
Mvoa	—	—	—	—	—	—	√	0.45	11.66
𝛼1	—	0.63	—	—	−0.68	—	—	0.06	—
𝛼2	—	2.79	—	—	2.36	—	—	1.99	—
𝛼3	—	—	—	—	3.71	—	—	—	—
Hit ratio (%)	89.21	89.59		86.50	86.89		59.57	62.66