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Statistics review 6: Nonparametric methods

Elise Whitley1 and Jonathan Ball2

Author Affiliations

1 Lecturer in Medical Statistics, University of Bristol, Bristol, UK

2 Lecturer in Intensive Care Medicine, St George's Hospital Medical School, London, UK

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Critical Care 2002, 6:509-513 doi:10.1186/cc1820

Published: 13 September 2002

Abstract

The present review introduces nonparametric methods. Three of the more common nonparametric methods are described in detail, and the advantages and disadvantages of nonparametric versus parametric methods in general are discussed.

Keywords:
nonparametric methods; sign test; Wilcoxon signed rank test; Wilcoxon rank sum test