Affordable Access

Access to the full text

Sample size determination in the Mann–Whitney test

Authors
  • Kornacki, Andrzej
  • Bochniak, Andrzej
  • Kubik-Komar, Agnieszka
Type
Published Article
Journal
Biometrical Letters
Publisher
De Gruyter Open
Publication Date
Dec 13, 2017
Volume
54
Issue
2
Pages
175–186
Identifiers
DOI: 10.1515/bile-2017-0010
Source
De Gruyter
Keywords
License
Green

Abstract

This paper discusses the problem of determining the number of observations necessary to apply the nonparametric Mann-Whitney test. We describe the method given by Noether (1987) for determining a sample size which guarantees that the Mann-Whitney test at a given significance level α has a predetermined power 1-β. The presented theory is tested by calculating the empirical power in computer simulations. The paper also raises the issue of the method of rounding the determined sample size to an even number when the sample is divided into two equinumerous subsamples.

Report this publication

Statistics

Seen <100 times