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. 2015 Apr 23;15:38. doi: 10.1186/s12874-015-0026-x

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© Li and Redden; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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The effects of variation of cluster sizes on the power of GLMM Wald F tests in analyzing CRTs with few heterogeneous clusters. The observed powers and the 95% confidence intervals are calculated from 1000 independent simulation replicates.