Post Hoc Inference for Component Attribution in Multivariate Change-Point Detection

arXiv:2607.14814 · stat.ME, math.ST, stat.ML · Submitted 2026-07-16 · Read on arXiv

Dhia-Elhaq Ouerfelli, Sylvain Arlot, Kevin Bleakley, Patrick Pamphile

stat.ME, math.ST, stat.ML

Submitted: 2026-07-16

Comments: 44 pages, 18 figures

Code: https://github.com/Dhia-Elhaq/Post-hoc-change-point-detection

License: http://creativecommons.org/licenses/by/4.0/

The gist: We consider the post-detection analysis of change-points for multivariate time series, with the goal of identifying which coordinates are responsible for a detected change.

Terminology

Abstract

We consider the post-detection analysis of change-points for multivariate time series, with the goal of identifying which coordinates are responsible for a detected change. After a change-point has been located by an offline detection algorithm, we propose post hoc statistical procedures to determine whether the change occurs in either of two predefined blocks of coordinates or in both. Our methods rely on two-sample testing procedures with a particular focus on nonparametric tests; we provide theoretical guarantees for Type I error control. Simulations and a real-data experiment demonstrate the strong performance of the proposed procedures.

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