Double Machine Learning based Program Evaluation under Unconfoundedness

Michael C. Knaus

arXiv 6 Mar 2020 · Econometrics · publishedEconometrics Journal (2022) · 99 citations (OpenAlex)

arXiv:2003.03191 · PDF · DOI · OpenAlex · Extracted main text

Abstract

This paper reviews, applies and extends recently proposed methods based on Double Machine Learning (DML) with a focus on program evaluation under unconfoundedness. DML based methods leverage flexible prediction models to adjust for confounding variables in the estimation of (i) standard average effects, (ii) different forms of heterogeneous effects, and (iii) optimal treatment assignment rules. An evaluation of multiple programs of the Swiss Active Labour Market Policy illustrates how DML based methods enable a comprehensive program evaluation. Motivated by extreme individualised treatment effect estimates of the DR-learner, we propose the normalised DR-learner (NDR-learner) to address this issue. The NDR-learner acknowledges that individualised effect estimates can be stabilised by an individualised normalisation of inverse probability weights.

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