Journal
STATISTICS IN MEDICINE
Volume 30, Issue 29, Pages 3461-3470Publisher
WILEY
DOI: 10.1002/sim.4407
Keywords
Wilcoxon rank sum test; exact variance method; delta method; power and sample size
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We derive an exact variance method for the size and power calculation for the Wilcoxon-Mann-Whitney test for ordered categorical data. The O'Brien-Castelloe approximation implemented in SAS version 9.2 (SAS Institute Inc., Cary, NC, USA) is simplified. Simulation studies show that the exact variance approach tends to be more accurate than the O'Brien-Castelloe approximation and the Zhao-Rahardja-Qu method derived under local alternatives. Copyright (C) 2011 JohnWiley & Sons, Ltd.
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