Estimating Productivity Loss Cost according to Severity of Vehicle Crash Injury

Table 5

Estimation results for WTP (Double-Hurdle model).

Variable	Minor injury		Moderate injury		Severe injury		Disability		Death
	Probit	Truncated	Probit	Truncated	Probit	Truncated	Probit	Truncated	Probit	Truncated
	Coef. (-value)	Coef. (-value)	Coef. (-value)	Coef. (-value)	Coef. (-value)	Coef. (-value)	Coef. (-value)	Coef. (-value)	Coef. (-value)	Coef. (-value)
Constant	−1.27 (−8.80)	−7.26 (−3.90)	−2.04 (−10.67)	−17.07 (−3.94)	−0.85 (−5.10)	−0.54 (−10.59)	0.16 (1.33)	−22.0 (−6.22)	−0.59 (−3.65)	−3.67 (−7.88)
EDU	1.54 (9.61)	2.17 (1.55)	1.61 (7.44)	3.14 (1.02)	0.37 (−5.10)	4.06 (4.69)	0.37 (2.68)	7.49 (3.06)	0.86 (5.13)	0.72 (−7.88)
GIN	—	—	1.59 (2.86)	6.49 (4.38)	1.14 (4.10)	1.20 (1.28)	0.39 (1.79)	6.76 (3.47)	0.75 (3.79)	0.88 (2.83)
HIN	—	—	—	—	—	—	0.34 (1.67)	3.34 (1.78)	0.87 (4.34)	0.25 (1.13)
INST	—	—	1.18 (5.89)	2.57 (0.63)	0.45 (2.88)	2.00 (2.22)	—	—	—	—
EXP	0.51 (2.00)	2.72 (2.51)	1.01 (2.04)	10.35 (5.30)	0.69 (3.77)	3.29 (0.25)	1.00 (1.89)	6.80 (3.19)	0.57 (2.77)	0.51 (1.66)
RESP	—	—	0.88 (3.52)	2.74 (2.03)	1.01 (6.71)	0.20 (3.70)	—	—	—	—
DAY	0.64 (3.11)	0.86 (0.85)	0.72 (2.41)	4.65 (2.78)	1.27 (3.69)	2.51 (2.43)	0.45 (2.01)	6.98 (3.86)	1.18 (2.96)	0.99 (2.62)
COMP	0.84 (3.33)	1.51 (1.48)	1.02 (3.52)	2.52 (1.69)	0.22 (0.86)	4.67 (5.13)	0.35 (1.61)	8.27 (4.77)	0.39 (1.72)	0.71 (2.14)
σ	—	1.81 (10.70)	—	4.29 (11.31)	—	2.30 (19.07)	—	4.45 (14.65)	—	0.66 (9.06)
Log-likelihood function	−83.21	−55.31	−120.05	−350.55	−261.30	−138.09	−253.77	−420.05	−200.81	−244.43
Pseudo ^2	0.67	—	0.59	—	0.29	—	0.06	—	0.21	—
Expected WTP excluding 0 (US$)	—	1,940	—	4,781	—	19,985	—	45,513	—	47,129
Observations	365		423		431		464		439

Note: indicates a significance level of 0.05; indicates a significance level of 0.1.