Measuring Program Effects in the Presence of Selection Bias: The Evolution of Practice

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The author applies a variety of methods for estimating the effects of employment and training programs on labor market behavior. This article traces how these methods have evolved over the past 10 years, focusing on the problem of selection bias. It discusses the context of measuring effects related to labor market activity, and then presents the essential elements of selection bias modeling and the specific changes that led to methods currently in use. It also provides an assessment of the benefits and potential weaknesses of these techniques.

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