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Table 2 Summary of the explicative model without including zero WTP or WTA 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 0.473 0.229 2.06 0.040 0.021 0.924  
Social Class*        
Group I -0.619 0.166 -3.72 <0.001 -0.946 -0.291 1.94
Group II -0.739 0.162 -4.56 <0.001 -1.058 -0.420 1.90
Group III -0.534 0.167 -3.20 0.001 -0.863 -0.206 1.74
Group IV -0.537 0.147 -3.65 <0.001 -0.826 -0.247 2.29
Age 0.016 0.003 4.77 <0.001 0.009 0.022 1.41
Income in the Area (Lower vs Upper tercile) 0.288 0.092 3.14 0.002 0.108 0.467 1.21
Adjusted family income (by 1000 €) -0.123 0.038 -3.23 0.001 -0.198 -0.048 1.33
Chronic Illness -0.178 0.094 -1.89 0.060 -0.364 0.007 1.38
  1. N 404, F 11.31 p < 0.001, Adjusted R2 0.203, Mean VIF 1.65
  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