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A Fully Sequential Elimination Procedure for Indifference-Zone Ranking and Selection with Tight Bounds on Probability of Correct Selection

Published: 01 August 2014 Publication History

Abstract

<P>We consider the indifference-zone (IZ) formulation of the ranking and selection problem with independent normal samples. In this problem, we must use stochastic simulation to select the best among several noisy simulated systems, with a statistical guarantee on solution quality. Existing IZ procedures sample excessively in problems with many alternatives, in part because loose bounds on probability of correct selection lead them to deliver solution quality much higher than requested. Consequently, existing IZ procedures are seldom considered practical for problems with more than a few hundred alternatives. To overcome this, we present a new sequential elimination IZ procedure, called BIZ (Bayes-inspired indifference zone), whose lower bound on worst-case probability of correct selection in the preference zone is tight in continuous time, and nearly tight in discrete time. To the author's knowledge, this is the first sequential elimination procedure with tight bounds on worst-case preference-zone probability of correct selection for more than two alternatives. Theoretical results for the discrete-time case assume that variances are known and have an integer multiple structure, but the BIZ procedure itself can be used when these assumptions are not met. In numerical experiments, the sampling effort used by BIZ is significantly smaller than that of another leading IZ procedure, the KN procedure, especially on the largest problems tested (214 = 16,384 alternatives).</P>

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Information & Contributors

Information

Published In

cover image Operations Research
Operations Research  Volume 62, Issue 4
August 2014
263 pages

Publisher

INFORMS

Linthicum, MD, United States

Publication History

Published: 01 August 2014
Accepted: 01 February 2014
Received: 01 September 2011

Author Tags

  1. Bayesian statistics
  2. indifference zone
  3. ranking and selection
  4. sequential analysis

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  • (2019)Predicting the Simulation Budget in Ranking and Selection ProceduresACM Transactions on Modeling and Computer Simulation10.1145/332371529:3(1-25)Online publication date: 18-Jun-2019
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  • (2018)Guarantees on the probability of good selectionProceedings of the 2018 Winter Simulation Conference10.5555/3320516.3320567(351-365)Online publication date: 9-Dec-2018
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