A simple approximation for evaluating external validity bias

Isaiah Andrews and Emily Oster

Economics Letters, 2019, vol. 178, issue C, 58-62

Abstract: We develop a simple approximation that relates the total external validity bias in randomized trials to (i) bias from selection on observables and (ii) a measure for the role of treatment effect heterogeneity in driving selection into the experimental sample.

Keywords: External validity; Randomized trials (search for similar items in EconPapers)
JEL-codes: C1 (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (10)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:ecolet:v:178:y:2019:i:c:p:58-62

DOI: 10.1016/j.econlet.2019.02.020

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