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Modelling zero bids in contingent valuation surveys

  • E. Strazzera
  • R. Scarpa
  • P. Calia
  • G. Garrod
  • K. Willis

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.

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Paper provided by Centre for North South Economic Research, University of Cagliari and Sassari, Sardinia in its series Working Paper CRENoS with number 200006.

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Date of creation: 2000
Date of revision:
Handle: RePEc:cns:cnscwp:200006
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  1. P. Calia & E. Strazzera, 1999. "A Sample Selection Model for Protest Non-Response Votes in Contingent Valuation Analyses," Working Paper CRENoS 199905, Centre for North South Economic Research, University of Cagliari and Sassari, Sardinia.
  2. Cameron, Trudy Ann, 1988. "A new paradigm for valuing non-market goods using referendum data: Maximum likelihood estimation by censored logistic regression," Journal of Environmental Economics and Management, Elsevier, vol. 15(3), pages 355-379, September.
  3. Carson, Richard T. & Hanemann, W. Michael, 2006. "Contingent Valuation," Handbook of Environmental Economics, in: K. G. Mäler & J. R. Vincent (ed.), Handbook of Environmental Economics, edition 1, volume 2, chapter 17, pages 821-936 Elsevier.
  4. Trudy Ann Cameron, 1991. "Interval Estimates of Non-Market Resource Values from Referendum Contingent Valuation Surveys," Land Economics, University of Wisconsin Press, vol. 67(4), pages 413-421.
  5. Trudy Ann Cameron & Michelle D. James, 1986. "Efficient Estimation Methods for "Closed-Ended" Contingent Valuation Surveys," UCLA Economics Working Papers 404, UCLA Department of Economics.
  6. Bengt Kristr�m, 1997. "Spike Models in Contingent Valuation," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 79(3), pages 1013-1023.
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