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Power for Detecting Treatment by Moderator Effects in Two- and Three-Level Cluster Randomized Trials
Peer reviewed
Direct linkSpybrook, Jessaca; Kelcey, Benjamin; Dong, Nianbo – Journal of Educational and Behavioral Statistics, 2016
Recently, there has been an increase in the number of cluster randomized trials (CRTs) to evaluate the impact of educational programs and interventions. These studies are often powered for the main effect of treatment to address the "what works" question. However, program effects may vary by individual characteristics or by context,…
Descriptors: Randomized Controlled Trials, Statistical Analysis, Computation, Educational Research
Spybrook, Jessaca; Shi, Ran; Kelcey, Benjamin – International Journal of Research & Method in Education, 2016
This article examines the statistical precision of cluster randomized trials (CRTs) funded by the Institute of Education Sciences (IES). Specifically, it compares the total number of clusters randomized and the minimum detectable effect size (MDES) of two sets of studies, those funded in the early years of IES (2002-2004) and those funded in the…
Descriptors: Randomized Controlled Trials, Federal Aid, Public Agencies, Comparative Analysis
