Dear Statman, Mark and P_Bartell,
thank you for all of you feedback (appreciated).
I took hints of knowledge.
The "misleading" JMP output for me was when I apply: analyze -> distribution -> cabability analysis.
In this case, the JMP (14) output is like below (plese take in consideration that this is a full invented data, the target was not use the correct distribution... but only uderstand how CPK in JMP is calculated).
![Simone1_0-1588453211561.png Simone1_0-1588453211561.png](https://community.jmp.com/t5/image/serverpage/image-id/23667i98AE824D59D5D57E/image-size/large?v=v2&px=999)
If I read this output: the CKP is calculated by the using of "overall sigma" and so this is not CPK but PPK...
This generated in me... some confusion.
I read your comment and I understand that for the capability analisys is better to use the command: analyze -> quality and process -> process capability.
Thanks.
Best regards,
Simone