Talk:Process capability index: Difference between revisions

Revision as of 13:43, 21 January 2014

Revision as of 10:02, 27 January 2014

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I am not an expert, so please someone revise it.

--[[Special:Contributions/59.66.122.148|59.66.122.148]] ([[User talk:59.66.122.148|talk]]) 13:08, 9 January 2014 (UTC)

:No, they're correct. For process capability to be valid, the process must be stable, so yields of Φ(sigma level) - Φ(-sigma level) as given in the table (in the article coupled with this talk page) are correct. As the [[Six Sigma]] article indicates, the yields presented there represent the worst case deterioration of 1.5σ before a [[control chart]] is expected to catch the shift or drift, so yields of Φ(sigma level - 1.5) - Φ(-sigma level - 1.5) (for a shift or drift upward; a shift or drift downward is equivalent—you can do the math) are correct in that article. No action required. -- [[User:DanielPenfield|DanielPenfield]] ([[User talk:DanielPenfield|talk]]) 10:02, 27 January 2014 (UTC)