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Direct linkHedges, Larry V.; Hedberg, Eric C. – Grantee Submission, 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, Academic Achievement
Massachusetts Department of Elementary and Secondary Education, 2012
The Massachusetts Department of Elementary and Secondary Education commissioned this paper to explore several questions about students who are English language learners (ELL) in Massachusetts: (1) For how many years is a typical ELL student in Massachusetts classified as limited English proficient (LEP)?; (2) How much variation is there in a the…
Descriptors: English Language Learners, Limited English Speaking, Classification, Student Characteristics
