My Reading on ASQ CQA HB Part V Part 2
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<strong>Part</strong> VD2<br />
Index<br />
C p = USL;LSL<br />
6σ<br />
C p, lower = μ;LSL<br />
3σ<br />
C p, upper = USL;μ<br />
3σ<br />
C pk =<br />
min [ USL;μ<br />
3σ<br />
C pm =<br />
Descripti<strong>on</strong><br />
Estimates what the process is capable of producing if the process mean were to<br />
be centered between the specificati<strong>on</strong> limits. Assumes process output is<br />
approximately normally distributed.<br />
Estimates process capability for specificati<strong>on</strong>s that c<strong>on</strong>sist of a lower limit <strong>on</strong>ly<br />
(for example, strength). Assumes process output is approximately normally<br />
distributed.<br />
Estimates process capability for specificati<strong>on</strong>s that c<strong>on</strong>sist of an upper limit <strong>on</strong>ly<br />
(for example, c<strong>on</strong>centrati<strong>on</strong>). Assumes process output is approximately<br />
normally distributed.<br />
Estimates what the process is capable of producing, c<strong>on</strong>sidering that the<br />
process mean may not be centered between the specificati<strong>on</strong> limits. (If the<br />
, μ;lSL<br />
] process mean is not centered, Cp overestimates process capability.) Cpk
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