Using a Generalized Linear Mixed Model to Analyze Dichotomous Choice Contingent Valuation Data

Ian H. Langford

Land Economics, 1994, vol. 70, issue 4, 507-514

Abstract: Willingness-to-pay (WTP) responses from dichotomous choice contingent valuation studies are often modeled using logistic regression, from which estimates of mean or median WTP are calculated. However, a great many factors influence an individual's WTP, some of which may be unobserved. Hence, the regression model may have inadequate explanatory power, and parameter estimates may be biased and their significance overestimated. The effects of this overdispersion are examined within a generalized linear mixed modeling framework, and an example given using published data from Cooper and Loomis (1992).

Date: 1994
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