Defects and Causes in Data Disaggregation

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Explore the intricacies of data disaggregation, common causes for defects, and how to differentiate signals of special causes from common causes. Discover the importance of not combining different non-conformities for accurate analysis.

  • Data analysis
  • Defects
  • Causes
  • Data disaggregation
  • Non-conformities

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Presentation Transcript


  1. Disaggregating data 1

  2. Example 11.2 data 2

  3. NP Chart of Total Defects 3

  4. Insensitivity in Chart Each X value plotted was a sum, i.e. = + + + .... X X X X 1 2 8 where = _ X Foreign Material 1 = _ X Damaged Edge etc. 2 4

  5. What is Common Cause for X? Assuming that different defects occur independently, Sigma(X) can be thought of as = + + + 2 1 2 2 2 8 ... X where = _ _ _ Common Cause defect i i 5

  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? 6

  7. Disaggregating the data 7

  8. Now Damaged Edge 8

  9. Sinks 9

  10. Damaged Mount 10

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

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