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A Robust Modification of the Ordered-Heterogeneity Test

机译:有序异质性测试的稳健修改

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An ordered heterogeneity (OH) test is a test for a trend that combines a non-directional heterogeneity test with the rank-order information specified under the alternative. We propose two modifications of the OH test procedure: (1) to use the mean ranks of the groups rather than the sample means to determine the observed ordering of the groups, and (2) to use the maximum correlation out of the 2~(k-1) - 1 possibilities under the alternative rather than the single ordering (1, 2, ..., k), where k is the number of independent groups. A simulation study indicates that these two changes increase the power of the ordered heterogeneity test when, as common in practice, the underlying distribution may deviate from a normal distribution and the trend pattern is a priori unknown. In contrast to the original OH test, the modified OH test can detect all possible patterns under the alternative with a relatively high power.
机译:有序异质性(OH)检验是一种趋势检验,将非方向性异质性检验与备选方案中指定的等级信息结合在一起。我们提出了OH测试程序的两个修改:(1)使用组的平均等级而不是样本方法来确定观察到的组的顺序,(2)使用2〜( k-1)-在替代项下有1种可能性,而不是单一排序(1、2,...,k),其中k是独立组的数目。仿真研究表明,这两种变化增加了有序异质性检验的能力,而在实践中,通常情况下,基础分布可能偏离正态分布,并且趋势模式是先验未知的。与原始OH测试相反,修改后的OH测试可以以相对较高的功率检测替代方案下的所有可能模式。

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