Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub


    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.

    Publication Notes

    • You may send email to to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    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


    contingent valuation, surveys, willingness to pay

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page