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arXiv · 1903.03283

On the Informativeness of Measurements in Shiryaev's Bayesian Quickest Change Detection

Jason J. Ford·Jasmin James·Timothy L. Molloy
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Abstract

This paper provides the first description of a weak practical super-martingale phenomenon that can emerge in the test statistic in Shiryaev's Bayesian quickest change detection (QCD) problem. We establish that this super-martingale phenomenon can emerge under a condition on the relative entropy between pre and post change densities when the measurements are insufficiently informative to overcome the change time's geometric prior. We illustrate this super-martingale phenomenon in a simple Bayesian QCD problem which highlights the unsuitability of Shiryaev's test statistic for detecting subtle change events.

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Jason J. Ford, Jasmin James, Timothy L. Molloy. 2019-03-08. On the Informativeness of Measurements in Shiryaev's Bayesian Quickest Change Detection. https://arxiv.org/abs/1903.03283

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