Inference on Winners*

Isaiah Andrews, Toru Kitagawa and Adam McCloskey

The Quarterly Journal of Economics, 2024, vol. 139, issue 1, 305-358

Abstract: Policy makers, firms, and researchers often choose among multiple options based on estimates. Sampling error in the estimates used to guide choice leads to a winner’s curse, since we are more likely to select a given option precisely when we overestimate its effectiveness. This winner’s curse biases our estimates for selected options upward and can invalidate conventional confidence intervals. This article develops estimators and confidence intervals that eliminate this winner’s curse. We illustrate our results by studying selection of job-training programs based on estimated earnings effects and selection of neighborhoods based on estimated economic opportunity. We find that our winner’s curse corrections can make an economically significant difference to conclusions but still allow informative inference.

Date: 2024
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Related works:
Working Paper: Inference on winners (2020)
Working Paper: Inference on Winners (2019)
Working Paper: Inference on winners (2018)
Working Paper: Inference on winners (2018)
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