A Simple Approximation for Evaluating External Validity Bias
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.
Published Versions
Isaiah Andrews & Emily Oster, 2019. "A simple approximation for evaluating external validity bias," Economics Letters, vol 178, pages 58-62.