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XBar-charts display subgroup means (averages) and are referred to as location charts.
S-charts display subgroup standard deviations.
Levey-Jennings charts show a process mean with control limits based on a long-term sigma. The control limits are placed at 3s distance from the center line. The standard deviation, s, for the Levey-Jennings chart is calculated the same way standard deviation is in the Distribution platform.

Help created on 3/19/2020