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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总体上，混有添加剂煤粉的燃烧率相对于未添加任何物质的基准试样煤粉提高了20%左右，并对试验结果进行了极差和方差分析。

On the whole, the combustion efficiency of the coal powder with additives increases by 20%; meanwhile, the range analysis and variance analysis are used with the experimental data.

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本文给出了总体方差矩估计检验的样本崩溃点，并分析了该样本崩溃点的渐近正态性。

In this paper, We give the sample breakdown point of a test for moment estimation of population variance and analyze the asymptotically normal characteristic of the sample breakdown point.

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