SPIKE: Stata module to allow for a zero willingness to pay

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Authors Joao Pedro Azevedo
Journal/Conference Name American Journal of Agricultural Economics
Paper Category
Paper Abstract spike command allows for a non-zero probability of zero willingness-to-pay in referendum-style contingent valuation experiments as suggested by Kristrom (1997). This property is particular usefull in experiments in which a large fraction of the population chose not to consume good being offered. In such circunstances the use of traditional parametric models based on probit and logit models are likelly to predict a negative willingness-to-pay.
Date of publication 2010
Code Programming Language Stata

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