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Stopping problems with an unknown state
Erik Ekström, Yuqiong Wang · 2022-06-22 · via math.PR updates on arXiv.org

We extend the classical setting of an optimal stopping problem under full information to include for problems with an unknown state. The framework allows the unknown state to influence (i) the drift of the underlying process, (ii) the payoff functions, and (iii) the distribution of the time horizon. Since the stopper is assumed to observe the underlying process and the random horizon, this is a two-source learning problem. Assigning a prior distribution for the unknown state, filtering theory can be used to embed the problem in a Markovian framework, and we thus reduce the problem with incomplete information to a problem with complete information but with one more state-variable. We provide a convenient formulation of the reduced problem, based on a measure change technique that decouples the underlying process from the state variable representing the posterior of the unknown state. Moreover, we show by means of several new examples that this reduced formulation can be used to solve problems explicitly.

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