Pairwise Difference Representations of Moments: Gini and Generalized Lagrange identities

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Main Authors: Dufour, Jean-Marie, Taamouti, Abderrahim, Tong, Meilin
Format: Preprint
Published: 2025
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author Dufour, Jean-Marie
Taamouti, Abderrahim
Tong, Meilin
author_facet Dufour, Jean-Marie
Taamouti, Abderrahim
Tong, Meilin
contents We provide pairwise-difference (Gini-type) representations of higher-order central moments for both general random variables and empirical moments. Such representations do not require a measure of location. For third and fourth moments, this yields pairwise-difference representations of skewness and kurtosis coefficients. We show that all central moments possess such representations, so no reference to the mean is needed for moments of any order. This is done by considering i.i.d. replications of the random variables considered, by observing that central moments can be interpreted as covariances between a random variable and powers of the same variable, and by giving recursions which link the pairwise-difference representation of any moment to lower order ones. Numerical summation identities are deduced. Through a similar approach, we give analogues of the Lagrange and Binet-Cauchy identities for general random variables, along with a simple derivation of the classic Cauchy-Schwarz inequality for covariances. Finally, an application to unbiased estimation of centered moments is discussed.
format Preprint
id arxiv_https___arxiv_org_abs_2510_22714
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle Pairwise Difference Representations of Moments: Gini and Generalized Lagrange identities
Dufour, Jean-Marie
Taamouti, Abderrahim
Tong, Meilin
Methodology
Econometrics
We provide pairwise-difference (Gini-type) representations of higher-order central moments for both general random variables and empirical moments. Such representations do not require a measure of location. For third and fourth moments, this yields pairwise-difference representations of skewness and kurtosis coefficients. We show that all central moments possess such representations, so no reference to the mean is needed for moments of any order. This is done by considering i.i.d. replications of the random variables considered, by observing that central moments can be interpreted as covariances between a random variable and powers of the same variable, and by giving recursions which link the pairwise-difference representation of any moment to lower order ones. Numerical summation identities are deduced. Through a similar approach, we give analogues of the Lagrange and Binet-Cauchy identities for general random variables, along with a simple derivation of the classic Cauchy-Schwarz inequality for covariances. Finally, an application to unbiased estimation of centered moments is discussed.
title Pairwise Difference Representations of Moments: Gini and Generalized Lagrange identities
topic Methodology
Econometrics
url https://arxiv.org/abs/2510.22714