Ppk vs sample capability
I am comparing sample (or "short term") capability vs overall (or "long term") capability for several processes for my data set (cannot share), using JMP. I find that for some processes, the overall Ppk is smaller than the lowest sample capability. To give an example with reference to the picture below, for some processes, JMP gives me a Ppk smaller than 1.33 which is lowest capability for a sampl...