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Hedges, Larry V.; Hedberg, E. C. – Evaluation Review, 2013
Background: Cluster-randomized experiments that assign intact groups such as schools or school districts to treatment conditions are increasingly common in educational research. Such experiments are inherently multilevel designs whose sensitivity (statistical power and precision of estimates) depends on the variance decomposition across levels.…
Descriptors: Correlation, Multivariate Analysis, Educational Experiments, Statistical Analysis
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Snyder, Thomas D.; Dillow, Sally A.; Hoffman, Charlene M. – National Center for Education Statistics, 2009
The primary purpose of the "Digest of Education Statistics" is to provide a compilation of statistical information covering the broad field of American education from prekindergarten through graduate school. The "Digest" includes a selection of data from both government and private sources, and draws especially on the results…
Descriptors: Homework, Undergraduate Students, Substance Abuse, Elementary Secondary Education