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Understanding Uncertainty's Impact on Conformance Testing

Delve into the critical role of measurement uncertainty in conformance testing, covering tolerance/intervals, risk assessment, and decision-making processes. Learn how knowledge of measurand and probability influence outcomes.

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Understanding Uncertainty's Impact on Conformance Testing

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  1. The role of uncertainty of measurement in conformance testing Steve Sidney Steve Sidney Consulting

  2. Introduction • Tolerance limits and intervals • Acceptance limits • Knowledge of the measurand • Probability of conformance • Consumer / producer risks • Summary

  3. Introduction • What is conformity assessment • Inspection • Role of measurement • UoM • Probability • Decide if item conforms to specified requirement • Risk

  4. Intervals and Limits

  5. Probability & UoM

  6. Knowledge of Measurand – GUM • Conditional PDF • Poor knowledge – broad PDF • Measurements sharpen PDF • Measurement effectively updates pre-measurement (prior), yielding post measurement (posterior) & includes measurement data. • Bayes theorem (conditional probability)

  7. Decisions to be made • Accept item • Reject item • Perform another measurement

  8. Consumer / Producer Risk • Valid Acceptance • False Acceptance • Valid Rejection • False Rejection

  9. Probability of conformance

  10. Risk False Rejection False Acceptance Valid Acceptance Valid Rejection Limit

  11. Summary • Importance of UoM • Guidelines BIPM JCGM 106 (Evaluation of measurement data – The role of MU in CA) http://www.bipm.org

  12. Thank you

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