Rasmussen, "Software Tools for the Expression of Uncertainty in Measurement," MetroTrade Workshop on Traceability and Measurement Uncertainty in Testing, Berlin, January 30–31, 2003. International Organization for Standardization, Guide to the Expression of Uncertainty in Measurement, Geneva, Switzerland: ISO, 1995. European Cooperation for Accreditation of Laboratories, Expression of the Uncertainty of Measurement in Calibration, EAL-R2 and EAL-R2-S1, 1997. The present version only uses the analytical solutions. A version of this Demonstration using uncertain calculus rules, interval arithmetic, and the derived analytical solutions has been explored to verify that both approaches give the same results. The rules extracted from the Uncertain Calculus package and lists have been used to derive analytical solutions for uncertain and interval area, perimeter, and diagonal. The new concept is based on the estimated value and uncertainty using the same law of uncertainty propagation. The traditional uncertainty concept focuses on unknowable error and true value using the so-called general law of error propagation. The package transforms any functional relationship of uncertain numbers into an uncertain number, by using the general law of uncertainty propagation: It is based on two assumptions: the functions manipulated have attribute NumericFunction and the relations Greater, GreaterEqual, Less, LessEqual, SameQ, Unequal, UnsameQ are independent of the uncertainties. To facilitate the calculation of the combined standard uncertainty, Aibe and Mikhailov introduced a new object called an uncertain number and developed in Mathematica an Uncertain Calculus package. Rasmussen refers to 10 different software packages. The needs of numerous testing laboratories to calculate the measurement uncertainty on a large scale is supported by numerous software tools. Just as the International System of Units (SI) has brought coherence to all scientific and technological measurements, the worldwide consensus on uncertainty permits a vast spectrum of results to be readily understood and properly interpreted. There is international consensus on the evaluation of standard uncertainty and combined standard uncertainty in measurement and computations.
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