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Talk:Process performance index/Archives/2020

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Difference vs. Cp and Cpk

I think this is just wrong:

"The indices are named differently in order to call attention to whether the process under study is believed to be in control or not."

Here's a web-reference from a reputable statistical software developer.

https://blog.minitab.com/blog/process-capability-statistics-cpk-vs-ppk

Wes Hermann (talk) 20:13, 3 March 2020 (UTC)