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Direct linkSpybrook, Jessaca; Raudenbush, Stephen W. – Educational Evaluation and Policy Analysis, 2009
This article examines the power analyses for the first wave of group-randomized trials funded by the Institute of Education Sciences. Specifically, it assesses the precision and technical accuracy of the studies. The authors identified the appropriate experimental design and estimated the minimum detectable standardized effect size (MDES) for each…
Descriptors: Research Design, Research Methodology, Effect Size, Correlation
Peer reviewedSlavin, Robert E. – Educational Evaluation and Policy Analysis, 1991
Evaluations of IBM's Writing to Read program for kindergartners and first graders are reviewed. The 21 kindergarten studies evidenced a median effect size of 0.23; however, in many cases this effect may be a result of comparisons with nonacademic programs. Across 13 first grade studies, the median effect size was 0.00. (TJH)
Descriptors: Computer Assisted Instruction, Effect Size, Elementary School Students, Evaluation Research
