Overview
FrançaisABSTRACT
Learning how to assess uncertainties is essential for any company. To date, although there is only one method to achieve this, two computational techniques are available, namely the Guide to the expression of uncertainty in measurement (GUM) which consists in propagating variances and that of its Supplement 1 based on the Monte Carlo simulation, that is to say, the propagation of distributions. The aim of this article is to assess these two complementary methods by showing the interest of the numerical method through a few examples.
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Read the articleAUTHORS
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François HENNEBELLE: Arts et Métiers engineer – Lecturer – Université de Bourgogne / Le2i
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Thierry COOREVITS: Arts et Métiers engineer – Lecturer-researcher – Arts et Métiers ParisTech Lille / MSMP
INTRODUCTION
Supplement 1 (JCGM 101:2008) of the 2008 Guide to the expression of uncertainty in measurement complements the GUM (Guide to the expression of uncertainty in measurement) (JCGM 100:2008) by proposing a new approach to the estimation of measurement uncertainties. It concerns the propagation of input variable (parameter) distributions through a mathematical model of the measurement process. It is a practical alternative to GUM when the latter is not easily applicable, for example, if propagation on the basis of first-order Taylor expansion is unsatisfactory (inadequate model linearization) or if the probability density function for the output variable deviates significantly from a Gaussian distribution (leading to unrealistic confidence intervals). It therefore provides a general numerical approach that is compatible with all the general principles of GUM. The approach applies to models with a single output variable. The 2011 Supplement 2 (JCGM 102:2011), not covered here, is an extension to any number of output quantities.
After recalling the principle of estimating uncertainties by the analytical method and its drawbacks, the article explains the principle of the Monte Carlo method in comparison with the analytical method. The constraints and drawbacks of this numerical method are also explained. The paper is based on as many examples as possible, to give as many people as possible access to this technique.
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Distribution propagation
Bibliography
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Mathematica ® , Wolfram Mathematica: http://www.wolfram.com/mathematica and distributed by Ritme, http://www.ritme.com/fr/training/mathematica
Crystal Ball, ORACLE...
Standards and norms
- Measurement data evaluation – Guide to the expression of uncertainty in measurement. - JCGM 100:2008(F) -
- Evaluation of measurement data – Supplement 1 to the " Guide to the expression of uncertainty in measurement ". – Propagation of distributions using a Monte Carlo Method. - JCGM 101:2008 -
- Evaluation of measurement data – Supplement 2 to the " Guide to the expression of uncertainty in measurement...
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Laboratories – Schools – Research centers
University of Burgundy, Auxerre
Le2i: Laboratoire Électronique, Informatique et Image, UMR CNRS 6306,
Arts et Métiers ParisTech...
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