The reason is simple: Cpk is a prediction, and one can only predict something that is stable. And process performance indices should only be used when statistical control cannot be evaluated.
原因很简单：Cpk只是一个预测，只能对稳定的东西作出预测，而过程表现PpK则应该用在还没有进行管制的过程。
The reason is simple: Cpk is a prediction, and one can only predict something that is stable. And process performance indices should only be used when statistical control cannot be evaluated.
原因很简单：Cpk只是一个预测，只能对稳定的东西作出预测，而过程表现PpK则应该用在还没有进行管制的过程。
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