介绍三种对多指标的质量控制方法，第一种方法是用一个标量控制多变量总体的均值向量和协方差矩阵；
Three approaches to Multivariate quality control are introduced. The first approach is to control the mean vector and covariance matrix of multivariate population in terms of one statistic.
介绍三种对多指标的质量控制方法，第一种方法是用一个标量控制多变量总体的均值向量和协方差矩阵；
Three approaches to Multivariate quality control are introduced. The first approach is to control the mean vector and covariance matrix of multivariate population in terms of one statistic.
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