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Direct linkRaudenbush, Stephen W.; Bloom, Howard S. – American Journal of Evaluation, 2015
The present article provides a synthesis of the conceptual and statistical issues involved in using multisite randomized trials to learn about and from a distribution of heterogeneous program impacts across individuals and/or program sites. Learning "about" such a distribution involves estimating its mean value, detecting and quantifying…
Descriptors: Program Effectiveness, Randomized Controlled Trials, Statistical Distributions, Computation
Download full textBloom, Howard S.; Weiland, Christina – Society for Research on Educational Effectiveness, 2014
Head Start is the largest publicly funded preschool program in the U.S., and one of its primary goals is to improve the school readiness of low-income children. As has been widely reported, the first randomized trial of Head Start in the program's history found some evidence that it is achieving this goal. Receiving one year of Head Start had…
Descriptors: Early Intervention, Preschool Education, Early Childhood Education, School Readiness
