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Effect sizes for nonparametric tests.

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  • Author(s): Fiel Peres F;Fiel Peres F
  • Source:
    Biochemia medica [Biochem Med (Zagreb)] 2026 Feb 15; Vol. 36 (1), pp. 010101. Date of Electronic Publication: 2025 Dec 15.
  • Publication Type:
    Journal Article; Review
  • Language:
    English
  • Additional Information
    • Source:
      Publisher: Croatian Society for Medical Biochemistry and Laboratory Medicine Country of Publication: Croatia NLM ID: 9610305 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1846-7482 (Electronic) Linking ISSN: 13300962 NLM ISO Abbreviation: Biochem Med (Zagreb) Subsets: MEDLINE
    • Publication Information:
      Publication: 2012- : Zagreb : Croatian Society for Medical Biochemistry and Laboratory Medicine
      Original Publication: Zagreb : Hrvatsko društvo medicinskih biokemičara
    • Subject Terms:
      Data Interpretation, Statistical* ; Sample Size* ; Statistics, Nonparametric*; Humans
    • Abstract:
      Effect size measures are important complements to P values, providing information about the magnitude and practical relevance of research findings. While widely discussed in the context of parametric tests, effect size estimation for nonparametric tests remains less explored. This article reviews standardized effect size measures applicable to four common nonparametric tests: Mann-Whitney, Wilcoxon signed-rank, Kruskal-Wallis, and Friedman. Commonly suggested classifications for these effect sizes are also discussed. This article aims to support researchers in reporting and interpreting effect sizes more effectively in nonparametric contexts.
      (Croatian Society of Medical Biochemistry and Laboratory Medicine.)
    • Abstract:
      Potential conflict of interest None declared.
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    • Contributed Indexing:
      Keywords: biostatistics; effect size; nonparametric statistics; writing in science
    • Publication Date:
      Date Created: 20251216 Date Completed: 20251216 Latest Revision: 20251218
    • Publication Date:
      20260130
    • Accession Number:
      PMC12701665
    • Accession Number:
      10.11613/BM.2026.010101
    • Accession Number:
      41399660