Guidelines for Expressing the Uncertainty of Measurement Results Containing Uncorrected Bias.
This paper proposes a method to extend the current ISOGuide to the Expression of Uncertainty in Measurementto 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 theGuideis proposed to address this special situation. The method keeps with the spirit of theGuidein 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.
National Institute of Standards and Technology, Gaithersburg, MD 20899-0001.
Steven D
SD
Phillips
National Institute of Standards and Technology, Gaithersburg, MD 20899-0001.
Keith R
KR
Eberhardt
Boeing Corporation, Seattle, WA 98124-2207.
Brian
B
Parry
bias; error; expanded uncertainty; measurement; uncertainty