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Modelling zero values and protest responses in contingent valuation surveys

Lookup NU author(s): Professor Guy Garrod, Emeritus Professor Ken Willis


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In contingent valuation surveys the category of zero bidders refers to individuals that are not willing to pay anything for the programme under analysis. Specific questions can help to identify true zero values, coming from people that are indifferent to the programme, separately from protest responses: the latter are generally excluded from the analysis. This paper introduces a mixture-sample selection model that takes into account both zero values and protest responses in the estimates. The model is applied to the valuation of a traffic calming scheme aimed at reducing risks for residents in three villages in the north-east of England.

Publication metadata

Author(s): Strazzera E, Scarpa R, Calia P, Garrod GD, Willis KG

Publication type: Article

Publication status: Published

Journal: Applied Economics

Year: 2003

Volume: 35

Issue: 2

Pages: 133-138

ISSN (print): 0003-6846

ISSN (electronic): 1466-4283

Publisher: Routledge


DOI: 10.1080/0003684022000015900


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