Attribute Control Charts(英文版)(pdf 9頁)

Attribute Control Charts(英文版)內容提要：
Using c-charts：
c-charts are most effective if:
1、Opportunity for a defect is large (e.g., lots of threads in 100 m of cloth that could snag).
2、Prob(defect) at a specific point is small.
3、Opportunity space is constant (e.g., every100 m).
4、Non-conformities occur randomly and areindependent of one another.
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