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E ffective use of Attribute Charts

E ffective use of Attribute Charts. Disaggregating data. Example 11.2 data. NP Chart of Total Defects. Insensitivity in Chart. Each X value plotted was a sum, i.e. where etc. What is Common Cause for X?.

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E ffective use of Attribute Charts

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  1. Effective use of Attribute Charts Disaggregating data

  2. Example 11.2 data

  3. NP Chart of Total Defects

  4. Insensitivity in Chart Each X value plotted was a sum, i.e. where etc.

  5. What is Common Cause for X? Assuming that different defects occur independently, Sigma(X) can be thought of as where

  6. What happens to Signals of Special Cause? • What would happen to a signal of Special Cause for defect 1 if all other defects were just reflective of Common Cause? • Where else did we encounter this problem? • How can this be resolved in each case?

  7. Disaggregating the data

  8. Now Damaged Edge

  9. Sinks

  10. Damaged Mount

  11. You get the idea Moral of the story, do not combine different non-conformities!!!

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