Valuing the water supply: ecosystem-based potable water supply management for the Legedadie-Dire catchments, Central Ethiopia

Ecological Processes

Table 5 Estimated coefficients (means and variances) of the three models in the WTP space

		Fixed		Uncorrelated (log-normal)		Correlated (random)
Attribute	Parameter	Estimate	Std. Err	Estimate	Std. Err	Estimate	Std. Err
Choice 1	Mean of Coeff.	27.02	0.135	27.00	0.135	28.05	0.140
Choice 1	Variance of Coeff.	5.38		5.37		5.82
Choice 2	Mean of Coeff.	27.96	0.326	27.48	0.387	32.25	0.403
Choice 2	Variance of Coeff.	31.29		44.17		47.81
Pressure	Mean of Coeff.	− 1.73	0.077	− 1.76	0.078	− 1.52	0.072
Pressure	Variance of Coeff.	1.74		1.79		1.51
Quantity	Mean of Coeff.	2.94	0.077	2.92	0.078	2.72	0.074
Quantity	Variance of Coeff.	1.75		1.80		1.62
Quality	Mean of Coeff.	5.48	0.097	5.51	0.098	5.45	0.096
Quality	Variance of Coeff.	2.77		2.82		2.69
Interruption	Mean of Coeff.	− 1.66	0.056	−v1.64	0.058	− 1.59	0.066
Interruption	Variance of Coeff.	0.93		0.98		1.29
Dysentery	Mean of Coeff.	− 0.98	0.056	− 0.96	0.057	− 0.93	0.063
Dysentery	Variance of Coeff.	0.91		0.95		1.16
Piped water	Mean of Coeff.	0.81	0.064	0.82	0.064	1.56	0.076
Piped water	Variance of Coeff.	1.19		1.21		1.68
Education	Mean of Coeff.	1.56	0.056	1.54	0.058	1.58	0.066
Education	Variance of Coeff.	0.93		0.98		1.29
Vendor	Mean of Coeff.	− 0.17	0.499	− 0.43^a	0.421	− 1.00	0.605
Vendor	Variance of Coeff.	0.01		0.00^b		1.00
Income	Mean of Coeff.	8.43	0.144	8.55^a	0.152	9.07	0.037
Income	Variance of Coeff.	0.00		4.82^b		2.69
Shortage	Mean of Coeff.	− 1.75	0.086	− 1.76^a	0.087	− 2.88	0.115
Shortage	Variance of Coeff.	0.01		0.00^b		7.54
Price	Mean of ln (Coeff.)	− 0.14^a	0.018	− 0.14^a	0.018	− 0.27^a	0.244
Price	Std. dev. of ln (Coeff.)	0.02		0.02		0.52
SLL at convergence		− 184.99		− 184.97		− 183.20
No. of iterations at convergence		3		7		8