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Process capability indices

Process capability indices

From the course: Cert Prep: Certified Six Sigma Green Belt

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Process capability indices

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I have explained process capability in earlier videos in the pre-requisite courses. Here I want to focus on key terminology and formulas. Like other formulas in the body of knowledge, you will have to know how to do the calculations. But the questions are multiple choice. So for example, the exam will provide you with a set of data. It will look like this, process mean, short term standard deviation, long term standard deviation, lower specs, upper specs, and target. Then the next 4 or 5 questions will be based on this data set, asking you for CP, CPU, Cpl. CPK, PP, PPK or even CPM. You have to calculate several indices based on the data set given. So the trick is knowing which numbers to use. Alright, to prepare you, we better go over these formulas and their proper inputs. If you haven't already, now is the time to start taking notes. Let's get started with process capability indices CP and CPK. Both of these indices assume that the process output follows a normal distribution, and…

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