Publication date: 04/30/2021
Control Limits for Median Moving Range Charts
Control limits for Median Moving Range charts are computed as follows.
LCLMMR = max(0, MMR - kd3(n)
)
UCLMMR = MMR + kd3(n)
where:
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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