Mathematics – Statistics Theory
Scientific paper
2011-05-11
Mathematics
Statistics Theory
Scientific paper
Brownian motion with known positive drift is sampled in stages until it crosses a positive boundary $a$. A family of multistage samplers that control the expected overshoot over the boundary by varying the stage size at each stage is shown to be optimal for large $a$, minimizing a linear combination of overshoot and number of stages. Applications to hypothesis testing are discussed.
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