Z shift

This topic has 5 replies, 6 voices, and was last updated 15 years, 8 months ago by Cordell Fife.

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December 8, 2006 at 4:37 pm #45472

Edwards
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A process operating at 6 sigma.

Assuming a shift of 1.5 sigma. What is Zst and Zlt?

Is it 6 and 4.5 respectively?

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December 8, 2006 at 5:44 pm #148691

Adrian P. Smith
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Yes (although this idea of 1.5 sigma shift is a contraversial one).

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December 8, 2006 at 6:32 pm #148696

The Force
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Zst = 1.5 + Zlt
Zst = 6 sigma focus while Zlt = 4.5 sigma focus

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December 8, 2006 at 8:21 pm #148703

Ashman
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Come on guys … everybody here knows that the Z shift is total crap. The 1.5 is just more of Harry foolishness.
Do we need to go over this again ?

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December 9, 2006 at 12:47 pm #148727

Schuette
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This should help you answer your question:

https://www.isixsigma.com/ask-dr-mikel-harry/why-15-subracted-short-term-estimate-capability-zst-get-long-term-estimate-capability-zlt/

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December 9, 2006 at 10:13 pm #148732

Cordell Fife
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This note is riddled with errors.
Z shifts don’t exist. 1.5 doesn’t exist. Don’t use them.

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