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View Paper |
Session Topic: 1B, Uncertainty Session |
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Paper Title: A Computer Program for a General Case Estimation of the Expanded Uncertainty |
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Date & Time: MONDAY, August 5, 2002 |
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10:45am - 12:15pm
PARALLEL SESSIONS - SESSION 1 |
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Speaker: Alex Lepek
Newton Metrology, Ltd. |
Email: nmetro@inter.net.il |
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The ISO Guide to the Expression of Uncertainty in Measurement provides a method for the estimation of combined standard uncertainty of a stationary measurand. However, the provided method for the expanded uncertainty is not complete. Particularly, it does not include the case where the contributing components are correlated to some degree. Also, the probability distribution of the combined uncertainty must be close to a student distribution otherwise a special scheme (e.g. looking for the dominant contributor distribution) must be used. In the present paper I describe a uniform approach for the estimation of the expanded uncertainty, which includes the case of correlations and arbitrary distributions. The method is based on a combination of the ISO guide and Monte-Carlo simulation. Because of the Monte-Carlo simulation, a numerical solution approached must be used. A computer program that implements the two approaches is presented. Some example results obtained by the program using both methods are compared and discussed. |
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