Understanding statistical power

B. J. Norton; M. J. Strube

doi:10.2519/jospt.2001.31.6.307

Understanding statistical power

B. J. Norton, M. J. Strube

Program in Physical Therapy

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

Abstract

This article provides an introduction to power analysis so that readers have a basis for understanding the importance of statistical power when planning research and interpreting the results. A simple hypothetical study is used as the context for discussion. The concepts of false findings and missed findings are introduced as a way of thinking about type I and type II errors. The primary factors that affect power are described and examples are provided. Finally, examples are presented to demonstrate 2 uses of power analysis, 1 for prospectively estimating the sample size needed to insure finding effects of a known magnitude in a study and 1 for retrospectively estimating power to gauge the likelihood that an effect was missed.

Original language	English
Pages (from-to)	307-315
Number of pages	9
Journal	Journal of Orthopaedic and Sports Physical Therapy
Volume	31
Issue number	6
DOIs	https://doi.org/10.2519/jospt.2001.31.6.307
State	Published - 2001

Keywords

Effect size
Power analysis

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10.2519/jospt.2001.31.6.307

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Understanding statistical power

Abstract

Keywords

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