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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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O'Conner, Rosemarie; Abedi, Jamal; Tung, Stephanie – Regional Educational Laboratory Mid-Atlantic, 2012
This study describes English language learner (ELL) student enrollment and achievement trends in Delaware public schools from 2002/03 to 2008/09. Two research questions guide this study: (1) How did the enrollment of ELL students in Delaware public schools change between 2002/03 and 2008/09?; and (2) How did performance (the percentage scoring at…
Descriptors: Academic Achievement, Achievement Gap, Comparative Analysis, Educational Change
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PDF on ERIC Download full text
O'Conner, Rosemarie; Abedi, Jamal; Tung, Stephanie – Regional Educational Laboratory Mid-Atlantic, 2012
This study describes English language learner (ELL) student enrollment and achievement trends in Delaware public schools from 2002/03 to 2008/09. Two research questions guide this study: (1) How did the enrollment of ELL students in Delaware public schools change between 2002/03 and 2008/09?; and (2) How did performance (the percentage scoring at…
Descriptors: Academic Achievement, Achievement Gap, Comparative Analysis, Educational Indicators