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What Can Be Learned From Empirical Evaluations of Nonexperimental Methods?
Evaluation Review 2018 April
Given the widespread use of nonexperimental (NE) methods for assessing program impacts, there is a strong need to know whether NE approaches yield causally valid results in field settings. In within-study comparison (WSC) designs, the researcher compares treatment effects from an NE with those obtained from a randomized experiment that shares the same target population. The goal is to assess whether the stringent assumptions required for NE methods are likely to be met in practice. This essay provides an overview of recent efforts to empirically evaluate NE method performance in field settings. We discuss a brief history of the design, highlighting methodological innovations along the way. We also describe papers that are included in this two-volume special issue on WSC approaches and suggest future areas for consideration in the design, implementation, and analysis of WSCs.
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