Why Are We Still Talking about Cp/Cpk and Pp/Ppk Formulas?
I found a discussion on MyASQ’s Website about Cpk formulas. Why is anyone talking about how to calculate formulas by hand? It’s a waste of time. Here’s why:
“Hi, I’m Jay Arthur, author of “Lean Six Sigma Demystified” and QI Macros [software].
“This morning I was out on the myASQ website, and there was a question about Cp and Cpk and Ppk formulas and stuff like that. And there was, you know, “Well, standard deviation” and “Why do we have to do R Bar over D2?” or whatever it was, you know. The answers were like, “Well, you know, standard deviation is pretty close to whatever…”
“I was [thinking], “What is the question here?
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