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Sequential selection procedures: Using sample means to improve efficiency
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DOI：10.1016/j.ejor.2003.01.003.png)
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Abstract
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Two-stage selection procedures have been widely studied and applied to determine appropriate sample sizes for selecting the best of k designs. However, standard indifference-zone procedures are derived with a statistically conservative least-favorable-configuration assumption. The enhanced two-stage selection (ETSS) is a procedure that takes into account not only the variance of samples but also the difference between sample means when determining the sample sizes. This paper discusses an implementation of sequential ranking and selection procedures due to the ETSS procedure to avoid relying too much on information obtained in just one stage. We show that the needed ratios of sample sizes to maximize the probability of correct selection is approximately maintained at all iterations. An experimental performance evaluation demonstrates the efficiency of our sequential procedures. (c) 2004 Elsevier B.V. All rights reserved.
Keywords:
simulation
ranking and selection
sample-size allocation
indifference zone
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