Publication date: 05/24/2021

Control Limits for Median Moving Range Charts

Control limits for Median Moving Range charts are computed as follows:

LCLMMR = max(0, MMR - kd3(n)Equation shown here)

UCLMMR = MMR + kd3(n)Equation shown here

where:

MMR is the median of the nonmissing moving ranges.

Equation shown here = MMR/0.954

d3(n) is the standard deviation of the range of n independent normally distributed variables with unit standard deviation.

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