Exploring Risk Factors with Crash Severity on China Two-Lane Rural Roads Using a Random-Parameter Ordered Probit Model

Table 6

Estimation results for the random-parameter ordered probit model.

Variables	Mean	Standard error	Z	Prob. z >	Prob. ≤ 0) (%)	Prob. > 0 (%)
Constant	0.045	0.173	0.260	0.793	39.74	60.26
DR_LO	−0.29817	0.086	−3.470	0.001	4.81	95.19
DR_BE	−0.49270	0.083	−5.910	0.000	1.81	98.19
DR_BE	1.24031	0.078	15.810	0.000	0.99	99.01
RD_AS	−0.42897	0.095	−4.530	0.000	4.79	95.21
RD_AS	1.13642	0.093	12.190	0.000	0.99	99.01
EN_TA	−0.22026	0.084	−2.620	0.009	0.44	99.56
CR_FORM2	0.17047	0.095	1.800	0.071	3.59	96.41
CR_FORM3	−1.18383	0.224	−5.270	0.000	1.81	98.19
CR_FORM3	1.13642	0.093	12.190	0.000	0.99	99.01
VEH_TYPE3	0.96320	0.163	5.920	0.000	1.81	98.19

Note. The italicized ones represent estimates for the variables resulting in random parameters.  < 0.1,  < 0.05, and  < 0.001.