Cited by 518Probability and Statistical ResearchStatistical Distribution Estimation and ApplicationsAdvanced Statistical Methods and Models

Kurtosis as Peakedness, 1905–2014. R.I.P.

Open access
Westfall, Peter H.·2014·The American Statistician

Abstract

The incorrect notion that kurtosis somehow measures "peakedness" (flatness, pointiness or modality) of a distribution is remarkably persistent, despite attempts by statisticians to set the record straight. This article puts the notion to rest once and for all. Kurtosis tells you virtually nothing about the shape of the peak - its only unambiguous interpretation is in terms of tail extremity; i.e., either existing outliers (for the sample kurtosis) or propensity to produce outliers (for the kurtosis of a probability distribution). To clarify this point, relevant literature is reviewed, counterexample distributions are given, and it is shown that the proportion of the kurtosis that is determined by the central μ ± σ range is usually quite small.

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Crossref · 10.1080/00031305.2014.917055

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  • Kurtosis feature can provide information regarding the non-Gaussianity or impulsiveness of the vibration signals.

    “Kurtosis feature can provide the information regarding the non-Gaussianity or impulsiveness of the vibration signals [68,69].”

    From Vibration Analysis for Machine Monitoring and Diagnosis: A Systematic Review (2021) · cites this paper as [68]

    Section 3 (“How Data Look”; page unavailable) says sample kurtosis primarily reflects outliers, supporting its use as an indicator of extreme or impulsive observations. Section 4 compares kurtosis with that of a normal distribution, but the paper does not examine vibration signals or establish kurtosis as a measure of their non-Gaussianity. (LLM, conf=0.84)

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Research works printed but not linked: 2

  1. Katz DL Elmore JG Wild DMG Lucan SC Jekel's Epidemiology, Biostatistics and Preventive Medicine 2013 Elsevier Philadelphia 4th ed.
  2. Taylor SE McNutt Louise-Anne Kurtosis Encyclopedia of Epidemiology, Sarah Boslaugh 2008 Sage Publications CA.

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Authors
Westfall, P. H.
Affiliations
Texas Tech University (US)
Corresponding author
Westfall, Peter H.
Venue
The American Statistician
Published
2014-07-03
Volume
68
Issue
3
Pages
191-195
ISSN
  • 0003-1305 (ISSN-L)
  • 1537-2731
OpenAlex
W1966994480
Cited by
518
References
32
Citations by year
2026: 34 · 2025: 57 · 2024: 35 · 2023: 46 · 2022: 59 · 2021: 73 · 2020: 70 · 2019: 69 · 2018: 39 · 2017: 22 · 2016: 10 · 2015: 2 · 2014: 2
FWCI
12.69
Type
journal article
Language
en
Open access
Locations
  • The American Statistician (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • National Institutes of Health
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK089167)
Topics
  • Physical Sciences › Mathematics › Statistics and Probability › Probability and Statistical Research
  • Physical Sciences › Mathematics › Statistics and Probability › Statistical Distribution Estimation and Applications
  • Physical Sciences › Mathematics › Statistics and Probability › Advanced Statistical Methods and Models
Keywords
kurtosis, peakedness, outliers, distribution shape, sample kurtosis, probability distributions

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