Bounded distributions place limits on skewness and larger moments

PLoS One. 2024 Feb 9;19(2):e0297862. doi: 10.1371/journal.pone.0297862. eCollection 2024.

Abstract

Distributions of strictly positive numbers are common and can be characterized by standard statistical measures such as mean, standard deviation, and skewness. We demonstrate that for these distributions the skewness D3 is bounded from below by a function of the coefficient of variation (CoV) δ as D3 > δ - 1/δ. The results are extended to any distribution that is bounded with minimum value xmin and/or bounded with maximum value xmax. We build on the results to provide bounds for kurtosis D4, and conjecture analogous bounds exists for higher statistical moments.

Grants and funding

This material is based upon work supported by the National Science Foundation under Grant Nos. CBET-2002815 and CBET-2306371 The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.