Disorder problem
Open-knowledge reference entry

In the study of stochastic processes in mathematics, a disorder problem or quickest detection problem (formulated by Kolmogorov) is the problem of using ongoing observations of a stochastic process to detect as soon as possible when the probabilistic properties of the process have changed. This is a type of change detection problem.
An example case is to detect the change in the drift parameter of a Wiener process.
See also
Compound Poisson process
Notes
References
H. Vincent Poor and Olympia Hadjiliadis (2008). Quickest Detection (First ed.). Cambridge: Cambridge University Press. ISBN 978-0-521-62104-5.
Shiryaev, Albert N. (2007). Optimal Stopping Rules. Springer.
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