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JMP 12 Quality and Process Methods by SAS Institute

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Overview of the Control Chart Platform
A control chart is a graphical way to filter out routine variation in a process. Filtering out routine variation helps manufacturers and other businesses determine whether a process is stable and predictable. If the variation is more than routine, the process can be adjusted to create higher quality output at a lower cost.
All processes exhibit variation as the process is measured over time. There are two types of variation in process measurements:
Routine or common-cause variation. Even measurements from a stable process exhibit these random ups and downs. When process measurements exhibit only common-cause variation, the measurements stay within acceptable limits.
Abnormal or special-cause variation. ...

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