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Steven Glazerman; Larissa Campuzano; Nancy Murray – Evaluation Review, 2025
Randomized experiments involving education interventions are typically implemented as cluster randomized trials, with schools serving as clusters. To design such a study, it is critical to understand the degree to which learning outcomes vary between versus within clusters (schools), specifically the intraclass correlation coefficient. It is also…
Descriptors: Educational Experiments, Foreign Countries, Educational Assessment, Research Design
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Brown, Eric C.; Graham, John W.; Hawkins, J. David; Arthur, Michael W.; Baldwin, Megan M.; Oesterle, Sabrina; Briney, John S.; Catalano, Richard F.; Abbott, Robert D. – Evaluation Review, 2009
Communities That Care (CTC) is a prevention system designed to reduce adolescent substance use and delinquency through the selection of effective preventive interventions tailored to a community's specific profile of risk and protection. A community-randomized trial of CTC, the Community Youth Development Study, is currently being conducted in 24…
Descriptors: Longitudinal Studies, Cohort Analysis, Community Characteristics, Prevention
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Willemain, Thomas R.; Hartunian, Nelson S. – Evaluation Review, 1982
Two methods for dividing an interrupted time-series study between baseline and experimental phases when study resources are limited are compared. In fixed designs, the baseline duration is predetermined. In flexible designs the baseline duration is contingent on remaining resources and the match of results to prior expectations of the evaluator.…
Descriptors: Data Collection, Evaluation Methods, Evaluators, Research Design
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Trochim, William M.K. – Evaluation Review, 1982
Meta-analysis of Title I program evaluations shows the norm-referenced model overestimates positive effectiveness; while the regression-discontinuity design underestimates it. Potential biases include residual regression artifacts, attrition and time-of-testing problems in the norm-referenced design, and assignment, measurement, and data…
Descriptors: Compensatory Education, Data Collection, Elementary Secondary Education, Evaluation Methods