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Sample Size Estimation in Cluster Randomized Educational Trials: An Empirical Bayes Approach

University of Western Ontario

The educational field has now accumulated an extensive literature reporting on values of the intraclass correlation coefficient, a parameter essential to determining the required size of a planned cluster randomized trial. We propose here a simple simulation-based approach including all relevant information that can facilitate this task. An example and corresponding computer code is attached.

Key Words: empirical bayes • sample size estimation • school randomized trials • intraclass correlation coefficient

Journal of Educational and Behavioral Statistics, Vol. 34, No. 2, 229-237 (2009)
DOI: 10.3102/1076998609332756


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