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1．什么是σσ是一个统计术语,衡量的是某一个事物的标准偏差。标准偏差σ的意义有两方面: (1)统计学意义:通过样本散布情况来衡量系统的稳定性; (2)工程学意义:过程一致性的衡量指标。
1. What is σσ is a statistical term that measures the standard deviation of a thing. The significance of the standard deviation σ is twofold: (1) Statistical significance: The stability of the system is measured by the distribution of samples; (2) The meaning of engineering is the measure of process consistency.