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Moving
Average Chart Calculations
Plotted statistic
Moving Average: The average of the current subgroup and the w-1 prior subgroups, where w is the cell size (the number of subgroups included in each moving average).
Center Line
Grand
Average
UCL , LCL (Upper and Lower
Control Limit)
The upper & lower control
limits for the Moving Average chart.
where n is the subgroup
size, w is the moving (cell) size,  x
is the process sigma based on the Moving Range (when n=1), Range or Sigma charts,
and X-doublebar is the Grand Average
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