![Six Sigma Capability (in 3 Power Point Slides!) 1. Here are simplified & easy-to-understand ways to describe defect rates! 2. Let’s fix capability analysis: Not Cp, Cpk, Pp or Ppk! Author: John Haury, Ph.D. [email_address] σ (sigma) & standard deviation (Std) are used interchangeably here. Contact me if you want to discuss short term & long term σ .](https://image.slidesharecdn.com/theessenceofsixsigma-090404140618-phpapp02/85/Six-Sigma-Capability-1-320.jpg)
![Confusion: 6 σ versus ±3 σ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Six Sigma is actually ±6 σ to the nearest specification (minimum).](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Six Sigma Capability
- 1. Six Sigma Capability (in 3 Power Point Slides!) 1. Here are simplified & easy-to-understand ways to describe defect rates! 2. Let’s fix capability analysis: Not Cp, Cpk, Pp or Ppk! Author: John Haury, Ph.D. [email_address] σ (sigma) & standard deviation (Std) are used interchangeably here. Contact me if you want to discuss short term & long term σ .
- 4. “ See” Capability by Histogram: Defect rate or number of σ to nearest spec -3 -2 -1 0 1 2 3 4 5 6 St Devs σ Upper Spec. Histogram & Specs work for any distribution to show defect rate ( w/ or w/out σ ) Cp not needed! After all, it is a unit-less ratio not easy to explain. Then add Cpk, Pp, Ppk, their confidence intervals & a ±1.5 σ shift? Histograms tell the story! By the way, Cp=Upper minus lower spec. divided by 6 σ (6 times the Std). Cpk is the distance from the mean to the nearest spec (in terms of σ ’s) divided by 3. Conclusion: Defect rates & associated costs!! Now that’s keeping score! Count or estimate the defect rate