A New Perspective on the Issue of Selection Bias into Randomized Controlled Field Experiments

Michèle Belot and Jonathan James
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Jonathan James: University of Bath

No 23/14, Department of Economics Working Papers from University of Bath, Department of Economics

Abstract: Most randomized controlled trials require the collaboration of field partners. Such self-selection could introduce a potential bias, because only the most optimistic may participate. We revisit this prediction. We argue that in many situations, the experimental intervention is competing with alternative interventions participants could conduct themselves outside the experiment. Since participants have a chance of being assigned to the control group, participating has a direct opportunity cost, which is likely to be higher for optimists. We propose a model of self-selection and show that both pessimists and optimists may opt out of the experiment, leading to an ambiguous selection bias.

Date: 2014
New Economics Papers: this item is included in nep-exp
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Citations: View citations in EconPapers (6)

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Journal Article: A new perspective on the issue of selection bias in randomized controlled field experiments (2014)
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Persistent link: https://EconPapers.repec.org/RePEc:eid:wpaper:39843

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