“This abstract discusses how to calculate power for three types of treatment heterogeneity including 1) the variability in treatment effects across sites, 2) site-specific treatment effects, and 3) moderator effects at the cluster or student level. The sample includes the studies in the first wave of CRTs funded by IES, or those funded between 2002 and 2006 by NCER and NCEE. These studies represent a range of CRTs on various topics and with different research designs and sample sizes.”


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