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A quickest detection problem with false negatives

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  • Tiziano De Angelis
  • Jhanvi Garg
  • Quan Zhou

Abstract

We formulate and solve a quickest detection problem with false negatives. A standard Brownian motion acquires a drift at an independent exponential random time which is not directly observable. Based on the observation in continuous time of the sample path of the process, an optimiser must detect the drift as quickly as possible after it has appeared. The optimiser can inspect the system multiple times upon payment of a fixed cost per inspection. If a test is performed on the system before the drift has appeared then, naturally, the test will return a negative outcome. However, if a test is performed after the drift has appeared, then the test may fail to detect it and return a false negative with probability $\epsilon\in(0,1)$. The optimisation ends when the drift is eventually detected. The problem is formulated mathematically as an optimal multiple stopping problem and it is shown to be equivalent to a recursive optimal stopping problem. Exploiting such connection and free boundary methods we find explicit formulae for the expected cost and the optimal strategy. We also show that when $\epsilon = 0$ our expected cost coincides with the one in Shiryaev's classical optimal detection problem.

Suggested Citation

  • Tiziano De Angelis & Jhanvi Garg & Quan Zhou, 2022. "A quickest detection problem with false negatives," Papers 2210.01844, arXiv.org.
  • Handle: RePEc:arx:papers:2210.01844
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    References listed on IDEAS

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    1. René Carmona & Nizar Touzi, 2008. "Optimal Multiple Stopping And Valuation Of Swing Options," Mathematical Finance, Wiley Blackwell, vol. 18(2), pages 239-268, April.
    2. Gordon R. Antelman & I. Richard Savage, 1965. "Surveillance problems: Wiener processes," Naval Research Logistics Quarterly, John Wiley & Sons, vol. 12(1), pages 35-55, March.
    3. Gapeev, P.V. & Peskir, G., 2006. "The Wiener disorder problem with finite horizon," Stochastic Processes and their Applications, Elsevier, vol. 116(12), pages 1770-1791, December.
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    Cited by:

    1. Ekström, Erik & Milazzo, Alessandro, 2024. "A detection problem with a monotone observation rate," Stochastic Processes and their Applications, Elsevier, vol. 172(C).

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