[2605.18798] Accurate Evaluation of Quickest Changepoint Detectors via Non-parametric Survival Analysis
[Submitted on 11 May 2026]
Title:Accurate Evaluation of Quickest Changepoint Detectors via Non-parametric Survival Analysis
View a PDF of the paper titled Accurate Evaluation of Quickest Changepoint Detectors via Non-parametric Survival Analysis, by Taiki Miyagawa and 1 other authors
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Abstract:We propose non-parametric estimators for the average run length (ARL) and average detection delay (ADD) in quickest changepoint detection (QCD) under finite and irregular sequence lengths. Although ARL and ADD are widely used as optimality criteria in theoretical and simulation studies, their application to real-world datasets is hindered by limited and irregular sequence lengths. To address this issue, we propose non-parametric estimators for the ARL and ADD, termed KM-ARL and KM-ADD, by drawing an analogy between QCD and survival analysis to model detection probabilities under sequence truncation. We derive estimation bias bounds and prove that they are asymptotically unbiased unless extrapolation is required. Experiments on simulated and real-world datasets demonstrate their practical utility, enhancing robustness against limited and irregular sequence lengths, improving interpretability, and facilitating empirical, intuitive model selection. Our Python code is provided at this https URL, offering ready-to-use implementations for practitioners.
Comments: Accepted to ICML 2026. GitHub: this https URL
Subjects:
Machine Learning (cs.LG); Information Theory (cs.IT); Statistics Theory (math.ST); Machine Learning (stat.ML)
Cite as: arXiv:2605.18798 [cs.LG]
(or arXiv:2605.18798v1 [cs.LG] for this version)
https://doi.org/10.48550/arXiv.2605.18798
arXiv-issued DOI via DataCite (pending registration)
Submission history
From: Taiki Miyagawa [view email] [v1] Mon, 11 May 2026 07:23:48 UTC (1,659 KB)
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