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Errors In Six Sigma Process. The six sigma and lean manufacturing process can be very hard to understand for a lot of people. Six is nothing but an indicator, an acceptable error rate. For exemplification, the companies that operate on the Sigma level 1 perform correctly in a 30 percent proportion. The Sigma number grows as the performance ameliorates.
The Sigma Quality Level feature is a simple statistic that puts a given defect rate on a âsix-sigmaâ scale. For example, on a scale of one million opportunities, 3.397 defects result in a six-sigma process. The computation that gives the Sigma Quality Level statistic is. Sigma Quality Level = NormalQuantile(1 â defects/opportunities) + 1.5.