Intraclass Correlation Values for Planning Group-Randomized Trials in Education

Resource type
Journal Article
Authors/contributors
Title
Intraclass Correlation Values for Planning Group-Randomized Trials in Education
Abstract
Experiments that assign intact groups to treatment conditions are increasingly common in social research. In educational research, the groups assigned are often schools. The design of group-randomized experiments requires knowledge of the intraclass correlation structure to compute statistical power and sample sizes required to achieve adequate power. This article provides a compilation of intraclass correlation values of academic achievement and related covariate effects that could be used for planning group-randomized experiments in education. It also provides variance component information that is useful in planning experiments involving covariates. The use of these values to compute the statistical power of group-randomized experiments is illustrated.
Publication
Educational Evaluation and Policy Analysis
Volume
29
Issue
1
Pages
60-87
Date
March 1, 2007
Journal Abbr
Educational Evaluation and Policy Analysis
Language
en
ISSN
0162-3737
Accessed
20/07/2020, 12:40
Library Catalogue
SAGE Journals
Extra
Publisher: American Educational Research Association
Citation
Hedges, L. V., & Hedberg, E. C. (2007). Intraclass Correlation Values for Planning Group-Randomized Trials in Education. Educational Evaluation and Policy Analysis, 29(1), 60–87. https://doi.org/10.3102/0162373707299706