![]() The lower case letter sigma ( σίγμα), the 18th letter of the modern Greek alphabet.It represented the voiceless alveolar fricative /s/. Lower-case sigma ( σίγμα), the 18th letter of the ancient Greek alphabet.( physics ) The Stefan-Boltzmann constant.Īncient Greek Alternative forms ĭerived from its majuscule counterpart Σ.( spatial databases ) The select operation.( phonology, obsolete ) a labialized alveolar fricative (value uncertain, possibly IPA ).( physics, scattering ) Cross section.( mathematics, statistics ) Standard deviation.That’s all you need to know to succeed a Six Sigma. Then start moving those charts in the right direction-fewer defects and less variation. Start drawing control charts, Pareto charts and histograms that illustrate the underlying patterns of performance. Only what an entire species does easily, naturally and by inclination is significant.” ![]() Devlin says: “What a few individuals may be trained to do doesn’t matter. I want to make Six Sigma edible by the masses. Because you need it to get by (no you don’t). Because that’s how I learned it (I went through this hell so should you). Why do Six Sigma books and course insist that everyone learn the formulas behind the charts and statistics? Here’s my short answers: Because it fills up the curriculum (I get paid more if I teach longer). You don’t need to know formulas to do Six Sigma, but you do need to understand the patterns revealed in the charts. I realize that most Six Sigma books and courses are filled with formulas and manual calculations, but all that does is traumatize students and waste time. Then we can do some root cause analysis to find and fix those performance problems. In Six Sigma, we can let QI Macros calculate the formulas and give us control charts, Pareto charts and histograms that show the underlying patterns of performance.
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