Contingent valuation models are used in Economics to value non-
market goods and can be expressed as binary choice regression models with one
of the regression coe±cients ¯xed. A method for °exibly estimating the link func-
tion of such binary choice model is proposed by using a Dirichlet process mixture
prior on the space of all latent variable distributions, instead of the more restricted
distributions in earlier papers. The model is estimated using a novel MCMC sam-
pling scheme that avoids the high autocorrelations in the iterates that usually arise
when sampling latent variables that are mixtures. The method allows for variable
selection and is illustrated using simulated and real data.