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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.
Generally, you would use a table, such as provided in my Six Sigma Demystified book, or you can calculate it directly in Excel using the formula =(NORMSINV(1-$D2))+1.5, where the data in cell D2 is entered as a decimal (for example, 30% error rate = 300,000 DPMO = 0.3 which calculates as 2.02 Sigma Level).