Literature DB >> 22086799

Size and power estimation for the Wilcoxon-Mann-Whitney test for ordered categorical data.

Yongqiang Tang1.   

Abstract

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 © 2011 John Wiley & Sons, Ltd.

Mesh：

Year:  2011        PMID： 22086799     DOI： 10.1002/sim.4407

Source DB:  PubMed          Journal:  Stat Med        ISSN： 0277-6715            Impact factor:   2.373


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