Publication date: 08/13/2020

Control Limits for Median Moving Range Charts

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

LCLMMR = max(0, MMR - kd3(n))

UCLMMR = MMR + kd3(n)


MMR is the median of the nonmissing moving ranges.

= 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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