S
Stevenli
There are a lot of thread to discuss the Cpk and Ppk, short-long vs. long term, or in other words within subgroup varaiation vs. total variation. My question is within subgroup variation is always smaller than total varation, so the Ppk is smaller than Cpk in Minitab. Is this true? I have run a case in Mintab that Cpk is smaller than Ppk. I am confused that how it comes.
Does anyone have some good ideas of that?
Thanks a lot.
Best Regards
Steven
Does anyone have some good ideas of that?
Thanks a lot.
Best Regards
Steven