The sampling constants can be estimated by means of sampling relative standard deviation or some relevant chemical and physical informations.
首先对被分析物料实验测定取样标准偏差，或进行一些有关的化学测试和物理测试，以确定取样常数。
It revealed that the product of the standard deviation of the estimated sampling variance and square root of the number of samples was a constant.
实验也证明，取样方差估计值的标准偏差与样本数目的平方根之积可近似为一常数。
The standard deviation in Process Capability Index(PCI) is estimated by using the subgroup ranges or the sample standard deviation.
在过程能力分析中通常采用子样级差或样本总体标准差来估计总体标准差。
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