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

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

  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
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
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
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
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
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
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
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
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
Variance of Coeff. 0.93   0.98   1.29  
Vendor Mean of Coeff. − 0.17 0.499 − 0.43a 0.421 − 1.00 0.605
Variance of Coeff. 0.01   0.00b   1.00  
Income Mean of Coeff. 8.43 0.144 8.55a 0.152 9.07 0.037
Variance of Coeff. 0.00   4.82b   2.69  
Shortage Mean of Coeff. − 1.75 0.086 − 1.76a 0.087 − 2.88 0.115
Variance of Coeff. 0.01   0.00b   7.54  
Price Mean of ln (Coeff.) − 0.14a 0.018 − 0.14a 0.018 − 0.27a 0.244
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  
  1. aMean of ln (coefficient)
  2. bVariance of ln (coefficient)