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Activity Number:
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369
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Type:
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Topic Contributed
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Date/Time:
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Wednesday, August 9, 2006 : 8:30 AM to 10:20 AM
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Sponsor:
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Section on Nonparametric Statistics
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| Abstract - #305642 |
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Title:
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Two-Sample, Ranked-Sum Test for Order-Restricted Randomized Designs
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Author(s):
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Yiping Sun*+ and Omer Ozturk
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Companies:
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The Ohio State University and The Ohio State University
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Address:
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P.O. Box 3646, Columbus, OH, 43210,
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Keywords:
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Mann-Whitney-Wilcoxon test ; Pitman efficacy ; clinical trials ; judgment ranking ; ranked-set sampling
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Abstract:
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It has been shown that the order-restricted randomized (ORR) design that relies on subjective judgment ranking to compare subsets of experimental units, improves statistical inference for the contrast between two levels of a treatment. This paper develops statistical inference (for Mann-Whitney-Wilcoxon statistics) for the location shift between control and treatment populations in an ORR design. It is shown that the asymptotic null distribution of the new test statistic is normal and it has desirable efficiency properties under high- and low-quality ranking. A simulation study indicates the proposed test performs well, even for small sample sizes. An example is provided to illustrate the use of the proposed test statistic.
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