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ISO 5725-2:2025

Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method

Edition date: 2025-12-18
In Force
Available languages: French, English
Summary:

1.1        This document

—          amplifies the general principles for designing experiments for the numerical estimation of the precision of measurement methods by means of a collaborative interlaboratory experiment,

—          provides a detailed practical description of the basic method for routine use in estimating the precision of measurement methods, and

—          provides guidance to all personnel concerned with designing, performing or analysing the results of the tests for estimating precision.

NOTE   Modifications to this basic method for particular purposes are given in other parts of ISO 5725.

1.2        It is concerned exclusively with measurement methods which yield measurements on a continuous scale and give a single value as the test result, although this single value can be the outcome of a calculation from a set of observations.

1.3        It assumes that in the design and performance of the precision experiment, all the principles as laid down in ISO 5725-1 are observed. The basic method uses the same number of test results in each laboratory, with each laboratory analysing the same levels of test sample; i.e. a balanced uniform-level experiment. The basic method applies to procedures that have been standardized and are in regular use in a number of laboratories.

1.4        The statistical model of ISO 5725-1:2023, Clause 5, is accepted as a suitable basis for the interpretation and analysis of the test results, the distribution of which is approximately normal.

1.5        The basic method, as described in this document, (usually) estimates the precision of a measurement method:

a)          when it is required to determine the repeatability and reproducibility standard deviations as defined in ISO 5725-1;

b)          when the materials to be used are homogeneous, or when the effects of heterogeneity can be included in the precision values;

c)          when the use of a balanced uniform-level layout is acceptable.

1.6        The same approach can be used to make a preliminary estimate of precision for measurement methods which have not reached standardization or are not in routine use.



1.1        Le présent document:

—          souligne les principes généraux applicables à la planification d'expériences pour l'estimation numérique de la fidélité des méthodes de mesure au moyen d'une expérience collaborative interlaboratoires;

—          fournit une description pratique détaillée de la méthode de base d'une utilisation courante pour l'estimation de la fidélité des méthodes de mesure; et

—          fournit des recommandations pour l'ensemble du personnel concerné par la planification, l'exécution ou l'analyse des résultats des essais pour l'estimation de la fidélité.

NOTE   Des modifications de cette méthode de base pour des cas particuliers sont données dans les autres parties de l'ISO 5725.

1.2        Il traite exclusivement des méthodes de mesure qui fournissent des mesures sur une échelle continue et qui donnent comme résultat d'essai une seule valeur, bien que cette valeur unique puisse être le résultat d'un calcul effectué à partir d'un ensemble d'observations.

1.3        Il prend pour hypothèse que pour la planification et l'exécution de l'expérience de fidélité, tous les principes donnés dans I'ISO 5725‑1 sont suivis. La méthode de base utilise le même nombre de résultats d'essai dans chaque laboratoire, chacun analysant les mêmes niveaux d'échantillons pour essai, c'est-à-dire une expérience à niveau uniforme équilibrée. La méthode de base s'applique à des procédures qui ont été normalisées et qui sont régulièrement utilisées dans un certain nombre de laboratoires.

1.4        Le modèle statistique de l'ISO 5725-1:2023, Article 5, est considéré comme une base appropriée pour l'interprétation et l'analyse des résultats d'essai dont la distribution est approximativement normale.

1.5        La méthode de base, telle que décrite dans le présent document, estime (généralement) la fidélité d'une méthode de mesure:

a)          lorsqu'il est nécessaire de déterminer l'écart-type de répétabilité et l'écart-type de reproductibilité tels qu'ils sont définis dans l'ISO 5725-1;

b)          lorsque les matériaux à utiliser sont homogènes ou lorsque les effets de l'hétérogénéité peuvent être inclus dans les valeurs de fidélité;

c)          lorsque l'utilisation d'un plan de niveau uniforme équilibré est admise.

1.6        Une approche similaire peut être appliquée à l'estimation préliminaire de la fidélité pour des méthodes de mesure qui n'ont pas atteint le stade de normalisation ou qui ne sont pas d'utilisation courante.
ICS: 17.020-Metrology and measurement in general, 03.120.30-Application of statistical methods
CTN: ISO/TC 69/SC 6 - 49808

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