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Designing Randomized Controlled Trials with External Validity in Mind

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  • Sylvain Chassang
  • Samuel Kapon

Abstract

This paper describes a number of strategies that experimenters may use to improve the external validity of their own findings, and of their research field as a whole. The paper emphasizes a dynamic view of research processes, in which learning about treatment and treatment adoption does not cease after a given study is performed. External validity need not be an unattainable goal in such a context. However, because researchers today need not be the same as researchers and policy-makers tomorrow, dynamic research processes are affected by research externalities, i.e. research practices that have high social value but low private returns. The paper identifies several of these research externalities and argues that funding organizations can have a significant impact at a relatively modest cost by subsidizing external-validity add-on modules specifically targeting research externalities.

Suggested Citation

  • Sylvain Chassang & Samuel Kapon, 2022. "Designing Randomized Controlled Trials with External Validity in Mind," NBER Working Papers 30762, National Bureau of Economic Research, Inc.
    • Handle: RePEc:nbr:nberwo:30762
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    More about this item

    JEL classification:

    • C90 - Mathematical and Quantitative Methods - - Design of Experiments - - - General
    • C93 - Mathematical and Quantitative Methods - - Design of Experiments - - - Field Experiments

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