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- W2064569363 abstract "The Levene test is a widely used test for detecting differences in dispersion. The modified Levene transformation using sample medians is considered in this article. After Levene's transformation the data are not normally distributed, hence, nonparametric tests may be useful. As the Wilcoxon rank sum test applied to the transformed data cannot control the type I error rate for asymmetric distributions, a permutation test based on reallocations of the original observations rather than the absolute deviations was investigated. Levene's transformation is then only an intermediate step to compute the test statistic. Such a Levene test, however, cannot control the type I error rate when the Wilcoxon statistic is used; with the Fisher–Pitman permutation test it can be extremely conservative. The Fisher–Pitman test based on reallocations of the transformed data seems to be the only acceptable nonparametric test. Simulation results indicate that this test is on average more powerful than applying the t test after Levene's transformation, even when the t test is improved by the deletion of structural zeros." @default.
- W2064569363 created "2016-06-24" @default.
- W2064569363 creator A5090617573 @default.
- W2064569363 date "2007-06-01" @default.
- W2064569363 modified "2023-10-14" @default.
- W2064569363 title "A comparative study of nonparametric two–sample tests after Levene's transformation" @default.
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- W2064569363 doi "https://doi.org/10.1080/00949650601173996" @default.
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