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50 Years of ERIC
50 Years of ERIC
The Education Resources Information Center (ERIC) is celebrating its 50th Birthday! First opened on May 15th, 1964 ERIC continues the long tradition of ongoing innovation and enhancement.

Learn more about the history of ERIC here. PDF icon

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Understanding Statistical Power in Cluster Randomized Trials: Challenges Posed by Differences in Notation and Terminology
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Spybrook, Jessaca; Hedges, Larry; Borenstein, Michael – Journal of Research on Educational Effectiveness, 2014
Research designs in which clusters are the unit of randomization are quite common in the social sciences. Given the multilevel nature of these studies, the power analyses for these studies are more complex than in a simple individually randomized trial. Tools are now available to help researchers conduct power analyses for cluster randomized…
Descriptors: Statistical Analysis, Research Design, Vocabulary, Coding
From Planning to Implementation: An Examination of Changes in the Research Design, Sample Size, and Precision of Group Randomized Trials Launched by the Institute of Education Sciences
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Spybrook, Jessaca; Puente, Anne Cullen; Lininger, Monica – Journal of Research on Educational Effectiveness, 2013
This article examines changes in the research design, sample size, and precision between the planning phase and implementation phase of group randomized trials (GRTs) funded by the Institute of Education Sciences. Thirty-eight GRTs funded between 2002 and 2006 were examined. Three studies revealed changes in the experimental design. Ten studies…
Descriptors: Educational Research, Research Design, Sample Size, Accuracy
Are Power Analyses Reported with Adequate Detail? Evidence from the First Wave of Group Randomized Trials Funded by the Institute of Education Sciences
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Spybrook, Jessaca – Journal of Research on Educational Effectiveness, 2008
This study examines the reporting of power analyses in the group randomized trials funded by the Institute of Education Sciences from 2002 to 2006. A detailed power analysis provides critical information that allows reviewers to (a) replicate the power analysis and (b) assess whether the parameters used in the power analysis are reasonable.…
Descriptors: Statistical Analysis, Correlation, Research Methodology, Research Design