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Table 3 Summary of the explicative model substituting zero responses for WTP or WTA for their estimated values.

From: Differences between willingness to pay and willingness to accept for visits by a family physician: A contingent valuation study

  Unstandardized coefficients t Sig. 95%
LLCI
95% ULCI VIF
  B Robust
S.E.
     
Constant 0.447 0.213 2.09 0.037 0.026 0.867  
Social Class*        
Group I -0.581 0.161 -3.61 <0.001 -0.897 -0.265 1.95
Group II -0.653 0.159 -4.11 <0.001 -0.966 -0.340 1.91
Group III -0.455 0.161 -2.81 0.005 -0.773 -0.137 1.78
Group IV -0.424 0.145 -2.92 0.004 -0.709 -0.138 2.33
Age 0.015 0.003 5.05 <0.001 0.009 0.021 1.44
Income in the Area (Lower vs Upper tercile) 0.242 0.084 2.86 0.004 0.076 0.408 1.20
Adjusted family income (by 1000 €) -0.117 0.035 -3.32 0.001 -0.186 -0.047 1.34
Chronic Illness -0.221 0.087 -2.53 0.012 -0.393 -0.050 1.39
  1. N 451, F 10.72, p < 0.001, Adjusted R2 0.185, Mean VIF 1.67
  2. Dependent variable ln (WTA/WTP)
  3. Robust S.E.: Robust standard error estimations
  4. Sig: Significance
  5. 95% LLCI: Lower Limit of the B 95% Confidence Interval
  6. 95% ULCI: Upper Limit of the B 95% Confidence Interval
  7. VIF: Variance Inflation Factor
  8. * Reference for Social Class: Group V