Six Sigma Tutorial
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- Six Sigma - Summary
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Six Sigma - Defect Metrics
Six Sigma - Defect Metrics
在我们向前迈进之前,让我们确定两个术语:
6个Sigma缺陷被定义为客户规格之外的任何东西。
6个西格玛机会是出现缺陷的机会总数。
本章提供了一种清单公式,通常用来衡量与六种西格玛缺陷有关的不同衡量尺度。
Defects Per Unit - DPU
Total Number of Defects
DPU = ------------------------
Total number of Product Units
可在波松配送中预测在一定比例的样本中出现缺陷的可能性。
Total Opportunities - TO
TO = Total number of Product Units x Opportunities
Defects Per Opportunity - DPO
Total Number of Defects
DPO = ------------------------
Total Opportunity
Defects Per Milpon Opportunities - DPMO
DPMO = DPO x 1,000,000
百分数 机会或DPMO然后可以转换成Sigma值,使用Yeld到Sigma换算表,载于
根据换算表——
6 Sigma = 3.4 DPMO
How to find your Sigma Level
Clearly define the customer s exppcit requirements.
Count the number of defects that occur.
Determine the yield-percentage of items without defects.
Use the conversion chart to determine DPMO and Sigma Level.
Simppfied Sigma Conversion Table
| If your yield is | Your DPMO is | Your Sigma is |
|---|---|---|
| 30.9% | 690,000 | 1.0 |
| 62.9% | 308,000 | 2.0 |
| 93.3 | 66,800 | 3.0 |
| 99.4 | 6,210 | 4.0 |
| 99.98 | 320 | 5.0 |
| 99.9997 | 3.4 | 6.0 |