A widely used process capability index. It is calculated by dividing the difference between the upper specification limit (USL) and the lower specification limit (LSL) by 6 times the standard deviation (s) or Cp=(upper specification limit (USL) -lower specification limit (LSL)) /6s.
广泛应用的过程能力指数。其计算方法是用公差上限（usl）与公差下限（lsl）之差除以6倍标准差（s）,即
Cp=公差上限（usl）-公差下限（lsl）/6s
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