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Activity Number: 369
Type: Contributed
Date/Time: Wednesday, August 6, 2008 : 8:30 AM to 10:20 AM
Sponsor: Section on Nonparametric Statistics
Abstract - #302281
Title: A Step-Down Pairwise Comparison Procedure Using Medians and Permutation Tests
Author(s): Scott Richter*+ and Melinda McCann
Companies: The University of North Carolina, Greensboro and Oklahoma State University
Address: , , ,
Keywords: permutation test ; multiple comparisons
Abstract:

In this paper is developed a step-down procedure based on the single step median-based procedure of Richter & McCann (2007). The sampling distribution is based on the permutation distribution of the maximum median difference among all pairs. The step-down procedure provides greater power for detecting group location differences while still maintaining strong FWE control. The new procedure can also be more powerful than popular step-down procedures for comparing normal means, especially for heavy tailed distributions.

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Revised September, 2008