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. 2010 Mar 29;5(3):e9788. doi: 10.1371/journal.pone.0009788

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Herberich et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Comparison of the estimated power of the max- test using a heteroscedastic consistent covariance estimation (max-+HC3) and of the Tukey-Kramer test (Tukey) assessing all pairwise comparisons of group effects in models under homoscedasticity (A), under heteroscedasticity with smaller variances in the smaller groups (B) and under heteroscedasticity with smaller variances in the larger groups (C). The total number of observations was unbalancedly distributed to the four groups.

Inline graphic — Comparison of the estimated power of the max- test using a heteroscedastic consistent covariance estimation (max-+HC3) and of the Tukey-Kramer test (Tukey) assessing all pairwise comparisons of group effects in models under homoscedasticity (A), under heteroscedasticity with smaller variances in the smaller groups (B) and under heteroscedasticity with smaller variances in the larger groups (C). The total number of observations was unbalancedly distributed to the four groups.