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Research ArticleExpert Review
Open Access

Post Hoc Power Calculations: An Inappropriate Method for Interpreting the Findings of a Research Study

Michael G. Heckman, John M. Davis III and Cynthia S. Crowson
The Journal of Rheumatology August 2022, 49 (8) 867-870; DOI: https://doi.org/10.3899/jrheum.211115
Michael G. Heckman
1M.G. Heckman, MS, Division of Clinical Trials and Biostatistics, Mayo Clinic, Jacksonville, Florida;
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John M. Davis III
2J.M. Davis III, MD, MS, Division of Rheumatology, Mayo Clinic, Rochester, Minnesota;
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Cynthia S. Crowson
3C.S. Crowson, PhD, Division of Rheumatology, and Division of Clinical Trials and Biostatistics, Mayo Clinic, Rochester, Minnesota, USA.
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Article Information

vol. 49 no. 8 867-870
DOI 
https://doi.org/10.3899/jrheum.211115
PubMed 
35105710

Published By 
The Journal of Rheumatology
Print ISSN 
0315-162X
Online ISSN 
1499-2752
History 
  • Accepted for publication January 7, 2022
  • Published online July 28, 2022.

Article Versions

  • Latest version (February 1, 2022 - 04:00).
  • Latest version (May 15, 2022 - 04:00).
  • You are viewing the most recent version of this article.
Copyright & Usage 
Copyright © 2022 by the Journal of Rheumatology This is an Open Access article, which permits use, distribution, and reproduction, without modification, provided the original article is correctly cited and is not used for commercial purposes.

Author Information

  1. Michael G. Heckman1,
  2. John M. Davis III2 and
  3. Cynthia S. Crowson3
  1. 1M.G. Heckman, MS, Division of Clinical Trials and Biostatistics, Mayo Clinic, Jacksonville, Florida;
  2. 2J.M. Davis III, MD, MS, Division of Rheumatology, Mayo Clinic, Rochester, Minnesota;
  3. 3C.S. Crowson, PhD, Division of Rheumatology, and Division of Clinical Trials and Biostatistics, Mayo Clinic, Rochester, Minnesota, USA.
  1. Address correspondence to Dr. C.S. Crowson, Division of Clinical Trials and Biostatistics, Mayo Clinic Rochester, 200 First St SW, Rochester, MN 55905, USA. Email: crowson{at}mayo.edu.

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The Journal of Rheumatology
Vol. 49, Issue 8
1 Aug 2022
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Post Hoc Power Calculations: An Inappropriate Method for Interpreting the Findings of a Research Study
Michael G. Heckman, John M. Davis, Cynthia S. Crowson
The Journal of Rheumatology Aug 2022, 49 (8) 867-870; DOI: 10.3899/jrheum.211115

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Post Hoc Power Calculations: An Inappropriate Method for Interpreting the Findings of a Research Study
Michael G. Heckman, John M. Davis, Cynthia S. Crowson
The Journal of Rheumatology Aug 2022, 49 (8) 867-870; DOI: 10.3899/jrheum.211115
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Jump to section

  • Article
    • Abstract
    • Appropriate use of power calculations
    • Inappropriate use of power calculations
    • A sound alternative to post hoc power calculations
    • Comments on other power analysis scenarios
    • Suggested best practices for performing power analysis
    • Footnotes
    • References
  • Figures & Data
  • Info & Metrics
  • References
  • PDF

Keywords

power
sample size
type I error
type II error
effect size

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Keywords

  • power
  • sample size
  • type I error
  • type II error
  • effect size

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