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Publication Citation: Guidelines for Expressing the Uncertainty of Measurement Results Containing Uncorrected Bias

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Author(s): Steven D. Phillips; K Eberhardt; B Parry;
Title: Guidelines for Expressing the Uncertainty of Measurement Results Containing Uncorrected Bias
Published: September 01, 1997
Abstract: This paper proposes a method to extend the current ISO Guide to the Expression of Uncertainty in Measurement to include the case of known, but uncorrected, measurement bias. It is strongly recommended that measurement results be corrected for bias, however, in some situations this may not be practical, hence an extension of the Guide is proposed to address this special situation. The method keeps with the spirit of the Guide in maintaining the link between uncertainty and statistical confidence. Similarly, the method maintains the transferability of one uncertainty statement to be included as a component in another uncertainty analysis. The procedure involves modifying the calculation of the expanded uncertainty, allowing it to become asymmetric about the measurement value. The method is compared to other alternative procedures, and an illustration of how it affects tolerance zones is presented.
Citation: Journal of Research of the National Institute of Standards and Technology
Volume: 102(5)
Pages: pp. 577 - 585
Keywords: bias;error;expanded uncertainty;measurement;uncertainty
Research Areas: Metrology, Manufacturing
PDF version: PDF Document Click here to retrieve PDF version of paper (144KB)