How does JMP calculate Ppk/Cpk?

[#1]

What equation does JMP use to calculate Ppk and Cpk values of a dataset given LSL and USL?

Is it exactly as the equation below or does JMP use a different variant?

Thanks,

s_ard

[#2 · Accepted solution]

Here is a selection taken from the JMP Documentation Library, on the Statistical Details for Cpk

cpk.PNG

The JMP Documentation Library is found under the Help pull down menu