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Control Chart

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The Control Chart is used in Statistical Precess Control (SPC) to monitor a production process.

The control chart can help UCL and LCL are not the specification limits!!


Data File

Common Control Chart interpretation (WECO) rules When one of these rules happens it will be visible as a red dot in the plot. If needed corrective actions must be taken to restore the process. Keep in mind a point outside the ULC and LCL will can occur in about 1 in the 371 data-points.

Calculations

UCL = Mean + 3 x STDEV
LCL = Mean - 3 x STDEV

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