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Randomised allocation of treatments in sequential trials

Published online by Cambridge University Press:  01 July 2016

John Bather
John Bather*
Affiliation:
University of Sussex
*
∗Postal address: School of Mathematical and Physical Sciences, The University of Sussex, Falmer, Brighton BN1 9QH, U.K.
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Abstract

Given a finite number of different experiments with unknown probabilities p1, p2, ···, pk of success, the multi-armed bandit problem is concerned with maximising the expected number of successes in a sequence of trials. There are many policies which ensure that the proportion of successes converges to p = max (p1, p2, ···, pk), in the long run. This property is established for a class of decision procedures which rely on randomisation, at each stage, in selecting the experiment for the next trial. Further, it is suggested that some of these procedures might perform well over any finite sequence of trials.

Keywords

BANDIT PROCESSESRANDOMISED ALLOCATION INDICESSEQUENTIAL MEDICAL TRIALS
Type
Research Article
Information
Advances in Applied Probability , Volume 12 , Issue 1 , March 1980 , pp. 174 - 182
Copyright
Copyright © Applied Probability Trust 1980 

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