The definitions of Cp, Cpk here are exactly the same as for Pp, Ppk in the article [[Process performance index]]. Are they meant to be the same and just used under different conditions (under statistical control, not under statistical control)? Or are they meant to be different? A statement about this is required. <!-- Template:Unsigned IP --><small class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/217.13.68.110|217.13.68.110]] ([[User talk:217.13.68.110#top|talk]]) 06:55, 18 July 2017 (UTC)</small> <!--Autosigned by SineBot-->
