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UCL

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Definition

The upper control limit shown on a statistical process control chart. Usually calculated as three Standard Deviations above the process mean. The standard deviation is either estimated using the average value of the range (R-Bar) and a table of Factors determined by sample size, or calculated directly from the subgroup data. See the entries on the specific control charts to find out how to calculate the UCL for those charts.

See Also

Control Limits
Statistical Process Control