Aggregation Biases in Stated Preference Studies

Posted: 15 Jan 2001


Stated preference studies are often used to provide estimates of non-market values for cost-benefit analysis. Applications of these techniques have been criticised because of the hypothetical nature of the surveys and the possibility of bias. Various types of bias have been cited including strategic, payment vehicle, starting point, interviewer and others. However, one type of bias that has received limited attention, but has the potential to have substantial impacts on value estimates, is that associated with aggregation. In this paper the theoretical basis for aggregation is explored, and alternative approaches for aggregation are trialed. It is demonstrated that the choices made by researchers at this stage of the value estimation process can significantly affect the estimates that are to be used in cost-benefit analyses.

JEL Classification: D70

Suggested Citation

Morrison, Mark, Aggregation Biases in Stated Preference Studies. Available at SSRN:

Mark Morrison (Contact Author)

Charles Sturt University ( email )

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Room: C2
Bathurst NSW 2795
(02) 6338 4253 (Phone)
(02) 6338 4769 (Fax)

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