Using exogenous characteristics to identify endogenous subgroups, the approach discussed in this method note creates symmetric subsets within treatment and control groups, allowing the analysis to take advantage of an experimental design. In order to maintain treatment--control symmetry, however, prior work has posited that it is necessary to use…

To answer "what works?" questions about policy interventions based on an experimental design, Peck (2003) proposes to use baseline characteristics to symmetrically divide treatment and control group members into subgroups defined by endogenously determined postrandom assignment events. Symmetric prediction of these subgroups in both…

Researchers and policy makers are increasingly dissatisfied with the "average treatment effect." Not only are they interested in learning about the overall causal effects of policy interventions, but they want to know what specifically it is about the intervention that is responsible for any observed effects. In the U.S., using…

This study addresses validity issues in evaluation that stem from Ernest R. House's book, "Evaluating With Validity". The authors examine "American Journal of Evaluation" articles from 1980 to 2010 that report the results of policy and program evaluations. The authors classify these evaluations according to House's "major approaches" typology…

This article uses propensity scores to identify subgroups of individuals most likely to experience a reduction in cash benefits because of sanctions in some of the programs that make up the National Evaluation of Welfare-to-Work Strategies. It extends program evaluation methodology by using propensity scoring to identify the subgroups of…

Proposes a methodology for analyzing the impacts of social programs on previously unexamined subgroups. The approach estimates the impact of programs on subgroups identified by a postreatment choice while maintaining the integrity of the experimental research design. (SLD)