文章基本信息

标题：A Test Of Symmetry
本地全文：下载
作者：Othman, Abdul R. ; Keselman, H. J. ; Wilcox, Rand R. 等
期刊名称：Journal of Modern Applied Statistical Methods
出版年度：2002
卷号：1
期号：2
页码：39
出版社：Wayne State University
摘要：When data are nonnormal in form classical procedures for assessing treatment group equality are prone to distortions in rates of Type I error and power to detect effects. Replacing the usual means with trimmed means reduces rates of Type I error and increases sensitivity to detect effects. If data are skewed, say to the right, then it has been postulated that asymmetric trimming, to the right, should be better at controlling rates of Type I error and power to detect effects than symmetric trimming from both tails of the data distribution. Keselman, Wilcox, Othman and Fradette (2002) found that Babu, Padmanabhan and Puri's (1999) test for symmetry when combined with a heteroscedastic statistic which compared either symmetrically or asymmetrically determined means provided excellent Type I error control even when data were extremely heterogeneous and very nonnormal in form. In this paper, we present a detailed discussion of the Babu et al. procedure as well as a numerical example demonstrating its use.
关键词：Symmetry; Preliminary test