Exact powers of the Wilcoxon test and the logrank test under random censoring
β Scribed by Shashikala Sukhatme; C.H. Lin
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 449 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0378-3758
No coin nor oath required. For personal study only.
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In two-sample studies with ordinal responses, the Wilcoxon rank-sum test is generally chosen to test equality of the distributions, in spite of it being a specific test of location shift. I compared the power of the exact tests based on the Wilcoxon statistic, OBrien's generalized Wilcoxon statistic
Three methods of approximating the power of Wilcoxon's rank-sum test against shift alternatives are studied. They are obtained by using a Gaussian assumption, Edgeworth expansion, or bootstrap. It is assumed that a historical data set is available to use in estimating the shape of the distribution.