A general treatment of ‘don't know’ responses from choice experiments

Kelvin Balcombe and Iain Fraser

European Review of Agricultural Economics, 2011, vol. 38, issue 2, 171-191

Abstract: In this paper, a modelling approach is developed for the treatment of ‘don't know’(DK) responses, within choice experiments (CEs). A DK option is motivated by the need to allow respondents the opportunity to express uncertainty. Our model explains a DK using an entropy measure of the similarity between options given to respondents within the CE. We illustrate our model by applying it to a CE examining consumer preferences for nutrient contents in food. We find that similarity between options in a given choice set does explain the tendency for respondents to report DK. , Oxford University Press.

Date: 2011
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