什么是6 Sigma?
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Measure“Sigma” 的术语是一个希腊字母用于描述变动性和作为一个显示失误发生频次的衡量值
中心正态分布+/-6 Sigma 边界LSL 正态分布中心
USL-6? -3?-2?-1?x +1?+2? +3?+6?Spec LimitPercentDefect. PPM+/-1 sigma68.27317,300+/-2 sigma95.4545,500+/-3 sigma99.732,700+/-4 sigma99.993763+/-5 sigma99.9999430.57+/-6 sigma99.99999980.002Introductions and Lean Six Sigma Course Overview45
1.5 个标准差移动的影响
LSL 正态分布发生偏移
USL-6?-3?-2?-1?x +1?+2?+3?+6?
Spec LimitPercentDefect. PPM+/-1 sigma30.23697,700+/-2 sigma69.13308,700+/-3 sigma93.3266,810+/-4 sigma99.37906,210+/-5 sigma99.97670233+/-6 sigma99.99966003.4MeasureWhat Is Six Sigma?
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The term “Sigma” is a Greek letter (s) used to describe
variability and is an indicator of how likely errors are to occur
Centered Normal Distribution +/-6 Sigma LimitsEffects of 1.5 Standard Deviation ShiftLSL Normal Distribution Centered USLLSL Normal Distribution Shifted USL-6? -3?-2?-1?x +1?+2? +3?+6?-6?-3?-2?-1?x +1?+2?+3?+6?
Spec LimitPercentDefect. PPMSpec LimitPercentDefect. PPM+/-1 sigma68.27317,300+/-1 sigma30.23697,700+/-2 sigma95.4545,500+/-2 sigma69.13308,700+/-3 sigma99.732,700+/-3 sigma93.3266,810+/-4 sigma99.993763+/-4 sigma99.37906,210+/-5 sigma99.9999430.57+/-5 sigma99.97670233+/-6 sigma99.99999980.002+/-6 sigma99.99966003.4Introductions and Lean Six Sigma Course Overview46
时刻关注成本
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Measure下面显示了一个最佳的品质水准点，减少缺陷的节省金额远超过改善质量水准的投入成本
质量水准在成本上的影响本成最佳水平Sigma 质量水准Introductions and Lean Six Sigma Course Overview47
MeasureCosts Are Always Kept in Mind
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There is an optimum quality level beyond which the costs of quality improvement exceed the expected cost savings from a reduced number of defects
Impact of Quality Level on CosttsoCOptimumSigma Quality LevelIntroductions and Lean Six Sigma Course Overview48
