FEEM working papers "Note di lavoro" series
1999 .010

Bias and Efficiency of Single vs Double Bound Models for Contingent Valuation Studies: a Monte Carlo Analysis

Authors: Elisabetta Strazzera, Pinuccia Calia
Series: Climate Change and Sustainable Development
Editor: Carlo Carraro
Type: Journal
Keywords: Contingent valuation,Single bound estimator,Double bound estimator,Bias,Statistical efficiency
JEL n.: C15,C35,D60,H41,Q26
JEL: Applied Economics
Pages: pp. 1329-1336
Date: 2000


The Dichotomous Choice Contingent Valuation Method can be used either in the single or double bound formulation. The former is easier to implement, while the latter is known to be more efficient. We analyse the bias of the ML estimates produced by either model, and the gain in efficiency associated to the double bound model, in different experimental settings. We find that there are no relevant differences in point estimates given by the two models, even for small sample size, and no estimator can be said to be less biased than the other. The greater efficiency of the double bound is confirmed, although differences tend to reduce by increasing the sample size. Provided that a reliable pre-test is conducted, and the sample size is large, use of the single rather than the double bound model is warranted.

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