A Simple Approximation for Evaluating External Validity Bias

Isaiah Andrews and Emily Oster

No 23826, NBER Working Papers from National Bureau of Economic Research, Inc

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.

JEL-codes: C1 C18 C21 (search for similar items in EconPapers)
Date: 2017-09
New Economics Papers: this item is included in nep-ecm
Note: DEV EH LS TWP
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Citations: View citations in EconPapers (4)

Published as Isaiah Andrews & Emily Oster, 2019. "A simple approximation for evaluating external validity bias," Economics Letters, vol 178, pages 58-62.

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