随机向量的数学期望。
隐式多值向量均衡问题 implicit multi-valued vector equilibrium problems
从应用角度出发，解决了双样本均值向量和协方差矩阵的检验问题。
The testing problem of double sample's average vector and covariance matrix has been solved in the paper.
介绍了工序中同时控制多个相关质量特性均值向量的T2控制图方法。
In this paper the method on T2 control chart, by which the sample mean vectors of several related quality characteristics are controlled simultaneously in a process, is introduced.
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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