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Session:
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5A - Uncertainty Analysis IV
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Date & Time:
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Tuesday August 8, 2:30 PM - 4:00 PM
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Paper Title:
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The Significance on Consumer and Producer Risk for Uncorrected Product and Measurement Biases
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Speaker:
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Ricardo Nicholas, Associate Technical Fellow
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CoAuthors:
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Speaker Info
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Company:
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The Boeing Company
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Department:
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Metrology Engineering
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Address:
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P.O. Box 3707, MC 2R-40
Seattle, WA, 98124, United States
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Phone:
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206-544-5227
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Email:
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ricardo.a.nicholas@boeing.com
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Abstract:
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Uncorrected product and measurement biases are routinely ignored in the calculation of consumer and producer risks. Unfortunately, this practice can unknowingly increase the magnitude of those risks to more than 50%. The users of measurement and test equipment that have been calibrated in that way will typically be accepting a much greater percentage of false accepts with potentially serious consequences. Prior to the development of computerized tools to calculate the affect of product distribution and measurement system distribution bias on consumer and producer risk, the assumption was made that these distributions were centered about their respective performance specification nominal values. Universally applied guardbands have been based on that special case which resulted in erroneous calculations of consumer and producer risks. Newly developed tools now permit accurate calculation of consumer and producer risks when either or both product and measurement distributions are biased. General cases can now be evaluated. To enable the reader to easily determine the magnitude on consumer and producer risks, tables are provided (with and without guardbanding considerations) as a function of the most significant variables, including all relevant definitions.
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