第三章介绍西格玛水平的计算方法，推导出过程无漂移和有漂移时，西格玛水平与产品不合格品率之间的函数关系式。
Chapter three illustrates how to calculate the sigma level and deduces the function between the sigma level and nonconforming rate whether the process has shift or not.
第三章介绍西格玛水平的计算方法，推导出过程无漂移和有漂移时，西格玛水平与产品不合格品率之间的函数关系式。
Chapter three illustrates how to calculate the sigma level and deduces the function between the sigma level and nonconforming rate whether the process has shift or not.
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