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Decoupling and randomization for double-indexed permutation statistics

Mingxuan Zou, Jingfan Xu, Peng Ding and Fang Han

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Abstract: This paper introduces a version of decoupling and randomization to establish concentration inequalities for double-indexed permutation statistics. The results yield, among other applications, a new combinatorial Hanson-Wright inequality and a new combinatorial Bennett inequality. Several illustrative examples from rank-based statistics, graph-based statistics, and causal inference are also provided.

Date: 2026-01
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