Cited by 371Statistical Methods in Clinical TrialsStatistical Methods and Bayesian InferenceMeta-analysis and systematic reviews

When to adjust alpha during multiple testing: a consideration of disjunction, conjunction, and individual testing

Open access
Rubin, Mark·2021·Synthese

Published version of a preprint

Abstract

Scientists often adjust their significance threshold (alpha level) during null hypothesis significance testing in order to take into account multiple testing and multiple comparisons. This alpha adjustment has become particularly relevant in the context of the replication crisis in science. The present article considers the conditions in which this alpha adjustment is appropriate and the conditions in which it is inappropriate. A distinction is drawn between three types of multiple testing: disjunction testing, conjunction testing, and individual testing. It is argued that alpha adjustment is only appropriate in the case of disjunction testing, in which at least one test result must be significant in order to reject the associated joint null hypothesis. Alpha adjustment is inappropriate in the case of conjunction testing, in which all relevant results must be significant in order to reject the joint null hypothesis. Alpha adjustment is also inappropriate in the case of individual testing, in which each individual result must be significant in order to reject each associated individual null hypothesis. The conditions under which each of these three types of multiple testing is warranted are examined. It is concluded that researchers should not automatically (mindlessly) assume that alpha adjustment is necessary during multiple testing. Illustrations are provided in relation to joint studywise hypotheses and joint multiway ANOVAwise hypotheses.

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  • Alpha levels of 0.05 without correction for multiple comparisons were applied because the analyses are exploratory and each outcome is best considered as individual tests rather than disjunction tests.

    “Alpha levels of 0.05 alpha without correction for multiple comparisons were applied, given that the analyses are exploratory and each outcome is best considered as individual tests rather than disjunction tests.75”

    From Acceptance and commitment therapy for mild traumatic brain injury (ACTion-mTBI): a quasiexperimental feasibility study (2025) · cites this paper as [75]

    The Abstract and Conclusions support not correcting alpha for multiple comparisons when outcomes are tested individually rather than as a disjunction test. But the Conclusions explicitly reject exploratory status as the reason for deciding whether to adjust alpha. The section ‘Distinguishing Between Alpha Specification and Alpha Adjustment’ also cautions that individual testing does not automatically justify an alpha level of .05. (LLM, conf=0.90)

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Research works printed but not linked: 3

  1. Kim, K., Zakharkin, S. O., Loraine, A., & Allison, D. B. (2004). Picking the most likely candidates for further development: Novel intersection-union tests for addressing multi-component hypotheses in comparative genomics. Proceedings of the American Statistical Association, ASA Section on ENAR Spring Meeting (pp. 1396-1402). http://www.uab.edu/cngi/pdf/2004/JSM%202004%20-IUTs%20Kim%20et%20al.pdf
  2. Rothman, K. J., Greenland, S., & Lash, T. L. (2008). Modern epidemiology (3 rd ed.). Lippincott Williams & Wilkins.
  3. Sinclair, J., Taylor, P. J., & Hobbs, S. J. (2013). Alpha level adjustments for multiple dependent variable analyses and their applicability-A review. International Journal of Sports Science Engineering, 7, 17-20.

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Authors
Rubin, M.
Affiliations
University of Newcastle Australia (AU)
Corresponding author
Rubin, Mark
Venue
Synthese
Published
2021-07-06
Volume
199
Issue
3-4
Pages
10969-11000
ISSN
  • 0039-7857 (ISSN-L)
  • 1573-0964
OpenAlex
W3178039131
Cited by
371
References
130
Citations by year
2026: 69 · 2025: 91 · 2024: 91 · 2023: 68 · 2022: 43 · 2021: 8 · 2020: 1
FWCI
39.15
Type
journal article
Language
en
Open access
Locations
  • Synthese (publishedVersion)
  • PhilSci-Archive (University of Pittsburgh) (acceptedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • Durham Research Online (Durham University) (submittedVersion)
  • Figshare (submittedVersion)
  • Durham Research Online (Durham University) (submittedVersion, cc-by)
  • PhilPapers (PhilPapers Foundation) (submittedVersion)
  • PsyArXiv (OSF Preprints) (submittedVersion, cc-by)
  • MetArXiv (OSF Preprints) (submittedVersion, cc-by-nd)
  • MetArXiv (OSF Preprints) (submittedVersion)
  • PsyArXiv (OSF Preprints) (submittedVersion)
  • NOVA (University of Newcastle Australia) (submittedVersion)
  • arXiv (Cornell University)
  • Psychology Archives (cc-by)
Topics
  • Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods in Clinical Trials
  • Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods and Bayesian Inference
  • Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Meta-analysis and systematic reviews
Keywords
multiple comparisons, individual testing, significance threshold, replication crisis, null hypothesis significance testing

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