Publication date: 05/24/2021

Levey-Jennings Charts

Levey-Jennings charts show a process mean with control limits based on a long-term sigma. The control limits are placed at K*s distance from the center line, where K = 3 by default.

The standard deviation, s, for the Levey-Jennings chart is calculated the same way standard deviation is in the Distribution platform.

Equation shown here

See Levey and Jennings (1950); Westgard (2002).

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