Selecting the Best Comparison Group and Evaluation Design: A Guidance Document for State Section 1115 Demonstration Evaluations

White Paper
Publisher: Washington, DC: Mathematica Policy Research
Jun 30, 2018
James D. Reschovsky, Jessica Heeringa, and Maggie Colby
This guidance document focuses on quantitative impact evaluations, which assess the causal effects of an intervention by comparing outcomes under the demonstration’s policies with an estimate of what would have happened under a counterfactual—that is, what would have happened in the absence of those policies or if the policies had been implemented differently.