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    Author(s): Gregory L. Poe; Michael P. Welsh; Patricia A. Champ
    Date: 1997
    Source: Land economics. 73(2): 255-267
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (394 KB)

    Description

    Dichotomous choice contingent valuation surveys frequently elicit multiple values in a single questionnaire. If individual responses are correlated across scenarios, the standard approach of estimating willingness to pay (WTP) functions independently for each scenario may result in biased estimates of the significance of the difference in mean WTP values. This paper applies an alternative bivariate probit approach that explicitly accounts for correlation across errors in the estimation of WTP and mean WTP. Using data from three separate dichotomous choice contingent valuation studies, this correlation is demonstrated to have an effect on the significance level of mean WTP difference tests.

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    Citation

    Poe, Gregory L.; Welsh, Michael P.; Champ, Patricia A. 1997. Measuring the difference in mean willingness to pay when dichotomous choice contingent valuation responses are not independent. Land economics. 73(2): 255-267

    Keywords

    contingent valuation, surveys, willingness to pay

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