Three approaches to Multivariate quality control are introduced. The first approach is to control the mean vector and covariance matrix of multivariatepopulation 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；
2
Multivariate analysis of the component data indicate that population Wenchuan is the most distinct.