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；
Our goal: commitment to walking in the most sophisticated printing equipment brands. Credibility is our strategy; leader. It is our professional approach. Our aim: 'quality first.
我们的目标：致力于走在印刷器材的最尖端品牌。 信誉是我们的战略；
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