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Process Sigma Calculator Assumptions
Definitions Understanding The Basic And Advanced Modes If you want to calculate the process Sigma using data other than long-term, you should switch to the Advanced Mode where you can change the process Sigma shift value from 1.5 to whatever you feel is appropriate. Here are a couple of examples to help illustrate the calculations. A long-term 93% yield (e.g. 100 opportunities, 7 defects) equates to a process Sigma long-term value of 1.48 (with no Sigma shift) or a process Sigma short-term value of 2.98 (with a 1.5 Sigma shift). A long-term 99.7% yield (e.g. 1,000 opportunities, 3 defects) equates to a process Sigma long-term value of 2.75 (with no Sigma shift) or a process Sigma short-term value of 4.25 (with the 1.5 sigma shift). Final Thought: When we talk about a Six Sigma process, we are referring to the process short-term (now). When we talk about DPMO of the process, we are referring to long-term (the future). We refer to 3.4 defects per million opportunities as our goal. This means that we will have a 6 sigma process now in order to have in the future (with the correction of 1.5) a 4.5 sigma process -- which produces 3.4 defects per million opportunities. Notice: Sigma with a capital "S" is used above to denote the process Sigma, which is different than the typical statistical reference to sigma with a small "s" which denotes the standard deviation. Understanding The Formula Alternatively, Understanding Negative Sigma Reproduction Without Permission Is Strictly Prohibited Copyright Requests Publish an Article: Do you have a Six Sigma tip, learning or case study? Share it with the largest community of Six Sigma professionals, and be recognized by your peers. It's a great way to promote your expertise and/or build your resume. Read more about submitting an article. "The Bottom Line" Links
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