This macro can be used along with a CUSUM chart to estimate the size of a small, sustained shift in a process mean. This shift size is also expressed in terms of the within-subgroup sigma estimate.
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Suppose your data are in C2, the subgroup size is 5, and the target is 25. You suspect that there is a process shift that starts in subgroup 19 and ends at subgroup 30. To run the macro, chooseand type:
%SHIFTSIZE C2 5 25 19 30
Click Submit Commands.