MONDAY, DECEMBER 11, 2017
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Dictionary Z Shift

Z Shift

Z shift is the difference between ZST and ZLT. The larger the Z shift, the more you are able to improve the control of the special factors identified in the subgroups.

Z shift is usually assumed to be 1.5 (ZST = ZLT+1.5). However it can be computed precisely for any given process by calculating its “Between sub-group variation” using Process Capability Analysis.



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