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The W-footrule coefficient: A copula-based measure of countermonotonicity
Enrique de Amo, David García-Fernández, Manuel Úbeda-Flores · 2026-03-09 · via math.ST updates on arXiv.org

We introduce the $W$-footrule coefficient $Φ_C$, a copula-based coefficient of negative association defined as the $L^1$-distance to the countermonotonic copula $W$. We prove that Gini's gamma admits the decomposition $γ_C = \frac{2}{3}(\varphi_C+Φ_C)$, linking it to Spearman's footrule $\varphi_C$. A rank-based estimator is introduced, with its strong consistency and asymptotic normality established via the functional delta method. Monte Carlo simulations confirm the estimator's finite-sample validity and its sensitivity to negative dependence structures.

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