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Modelling zero bids in contingent valuation surveys

Strazzera, Elisabetta - Calia, Pinuccia - Garrod, Guy - Willis, Ken (2000) Modelling zero bids in contingent valuation surveys. Working Paper. CRENoS.

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Official URL: http://www.crenos.it/working/pdf/00-6.pdf

Abstract

When modelling data generated from a discrete choice contingent valuation question, the treatment of zero bids affects the welfare estimates. Zero bids may come from respondents who are not interested in the provision of the public good; alternatively, some zero-bidders may be protesting about the valuation exercise, but hold positive values for the good. In this paper we investigate the effect of different levels of information on zero-bidders on welfare estimates for the population. We find that different strategies of identification may have non-trivial effects. We recommend use of full debriefing questions for zero-bidders, and use of sample selection models to correct for bias caused by protest behaviour

Item Type:Technical Report / Working Paper / Project Report (Working Paper)
Publisher:CRENoS
Date:May 2000
Institution:Universita' degli Studi di Cagliari
Divisions:Centri > CRENoS Centro Ricerche Economiche Nord Sud
Subjects:Area 13 - Scienze economiche e statistiche > SECS-S/05 Statistica sociale
Uncontrolled Keywords:Contingent Valuation, Zero Bids, Protest Votes, Selectivity Bias, Sample Selection Model, Survey Design
ID Code:313
Deposited On:13 Nov 2008 09:10

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