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.

[Category=Data Quality ]

Source: iSixSigma, 06 March 2011 09:55:10, https:web.archive.org/web/20111109014246/http:www.isixsigma.com/index.php?option=com_glossary