协方差
数学
秩(图论)
统计
协方差函数
协方差交集
协方差矩阵的估计
计量经济学
组合数学
摘要
Abstract Various methods are discussed for the problem of comparing two or more populations with respect to a response variable Y in the presence of a (possibly multivariate) concomitant variable X—a situation in which the usual method is the standard one-way analysis of covariance. A method based on ranks is developed.
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