Univariate Random Cut-Points Theory for the Analysis of Ordered Categorical Data
有序分类数据分析的单变量随机切点理论AI 解读 ↓
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有序分类数据分析的单变量随机切点理论AI 解读 ↓
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A new theory is developed for nonparametric analyses of r x k contingency tables, where the columns correspond to k ordered categories. The work is motivated by concern that conventional nonparametric theory yields inferences concerning the given categories, but results are often interpreted as if for a continuum. Asymptotic distributions are derived under random cut-points models for the Mann-Whitney (-Wilcoxon) U statistic. A model is recommended under which the exact moments of U are simple functions of k and the two sample sizes. For two more general models, the asymptotic variance is given for k ≤ 12 and k = 20, 30. Tables of empirical critical values show that the recommended model yields P values very close to P values under the general models.