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ERIC Number: EJ773068
Record Type: Journal
Publication Date: 2007-Aug-14
Pages: 15
Abstractor: Author
Reference Count: 30
ISSN: ISSN-1551-0670
Intraclass Correlations for Planning Group Randomized Experiments in Rural Education
Hedges, Larry V.; Hedberg, E. C.
Journal of Research in Rural Education, v22 n10 p1-15 Aug 2007
Experiments that assign intact groups (usually schools) to treatment conditions are increasingly common in educational research. The design of group randomized experiments requires knowledge of the intraclass correlation structure to compute statistical power and to determine the sample sizes required to achieve adequate power. The intraclass correlation structure of academic achievement is shown to be somewhat different in rural schools than in all schools in the nation. 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 rural schools. The use of these values to compute statistical power of group randomized experiments involving rural schools is illustrated. (Contains 4 tables.)
College of Education and Human Development. 5766 Shibles Hall, University of Maine, Orono, ME 04469. Tel: 207-581-2761; Web site:
Publication Type: Journal Articles; Reports - Research
Education Level: Elementary Secondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A