Estimating Smallholder Farmers’ Willingness to Pay for Sustainable Irrigation Water Use in North Western Ethiopia: A Contingent Valuation Method Study in Gumara Irrigation Project

Table 7

Parameter estimates of a seemingly unrelated bivariate probit model.

WTP	Coef	Robust Std. Err	Z	> |z|	[95% Conf. Interval]
B1	−0.0023819	0.0009627	−2.47	0.003	−0.0042688–−0.0004949
Constant	1.941436	0.5918425	3.28	0.001	0.7814456 3.101425
WTB2	Coef.	Robust std. Err	Z	P > |z|	[95% conf. Interval]
B2	−0.0005104	0.0003871	−1.32	0.0087	−0.001269 0.0002482
Constant	0.5545097	0.3694068	1.50	0.133	−.1695142 1.278534
Rho	0.6942757	0.1851148			.1544699 .9148696
Joint probability of success = 0.5785
Joint probability of failure = 0.1311
Wald test of rho = 0
chi2(1) = 5.7393
Prob > chi2 = 0.0166
Mean WTP = 950.7

Source: own survey, 2020.