Talk:Process performance index/Archives/2020 Source: en.wikipedia.org/wiki/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