Main informations

Collections

National standards and national normative documents

Publication date

December 1994

Number of pages

34 p.

Reference

NF ISO 5725-3

ICS Codes

03.120.30 Application of statistical methods

17.020 Metrology and measurement in general

Classification index

X06-041-3

Print number

1 - 24/01/2005

International kinship

ISO 5725-3:1994

Sumary

Application of statistics - Accuracy (trueness and precision) of measurement methods and results - Part 3 : intermediate measures of the precision of a standard measurement method

Le présent document traite exclusivement des méthodes de mesure qui fournissent des mesures sur une échelle continue et donnent une valeur unique comme résultat d'essai.

Replaced standards (1)

NF ISO 5725

December 1987

Standard Cancelled

Application of statistical. Precision of test methods. Determination of repeatability and reproducibility for A standard test method by inter-laboratory tests.

La présente norme donne les définitions pratiques de la répétabilité r et de la reproductibilité R qui se prêtent à une détermination numérique par essai. Elle présente les implications de ces définitions de r et de R. Elle établit des principes de base pour l'agencement, l'organisation et l'analyse des essais prévus pour la détermination de r et de R.

Standard replaced by (1)

NF ISO 5725-3

August 2023

Standard Current

Accuracy (trueness and precision) of measurement methods and results - Part 3: Intermediate precision and alternative designs for collaborative studies

This document provides a) a discussion of alternative experimental designs for the determination of trueness and precision measures including reproducibility, repeatability and selected measures of intermediate precision of a standard measurement method, including a review of the circumstances in which their use is necessary or beneficial, and guidance as to the interpretation and application of the resulting estimates, and b) worked examples including specific designs and computations. Each of the alternative designs discussed in this document is intended to address one (or several) of the following issues: a) a discussion of the implications of the definitions of intermediate precision measures; b) a guidance on the interpretation and application of the estimates of intermediate precision measures in practical situations; c) determining reproducibility, repeatability and selected measures of intermediate precision; d) improved determination of reproducibility and other measures of precision; e) improving the estimate of the sample mean; f) determining the range of in-house repeatability standard deviations; g) determining other precision components such as operator variability; h) determining the level of reliability of precision estimates; i) reducing the minimum number of participating laboratories by optimizing the reliability of precision estimates; j) avoiding distorted estimations of repeatability (split-level designs); k) avoiding distorted estimations of reproducibility (taking the heterogeneity of the material into consideration). Often, the performance of the method whose precision is being evaluated in a collaborative study will have previously been assessed in a single-laboratory validation study conducted by the laboratory which developed it. Relevant factors for the determination of intermediary precision will have been identified in this prior single-laboratory study.

Table of contents

View the extract

1 Domaine d'application
1
2 Références normatives
2
3 Définitions
2
4 Prescription générale
2
5 Facteurs importants
2
6 Modèle statistique
3
6.1
Modèle de base 3
6.2
Moyenne générale, m 3
6.3
Terme B 4
6.4
Termes B0), B(1), B(2), etc- 4
6.5
Terme d'erreur, e 5
7 Choix des conditions de mesure
5
8 Étude intralaboratoire et analyse des mesures intermédiaires de fidélité
6
8.1 Approche la plus simple
6
8.2 Méthode alternative
6
8.3 Effet des conditions de mesure sur le résultat final annoncé
7
9 Étude interlaboratoires et analyse des mesures intermédiaires de fidélité
7
9.1 Hypothèses sous-jacentes
7
9.2 Approche la plus simple
7
9.3 Expériences emboîtées
7
9.4 Expérience complètement emboîtée
8
9.5 Expérience irrégulièrement emboîtée
9
9.6 Affectation des facteurs dans un plan d'expérience emboité
9
9.7
Comparaison du plan emboîté avec la procédure donnée dans l'ISO 5725-2 9
9.8
Comparaison des plans d'expériences complètement et irrégulièrement emboîtés 9
Annexes
A
Symboles et abréviations utilisés dans PISO 5725 10
B
Analyse de la variance pour des expériences complètement emboîtées 12
C
Analyse de la variance pour des expériences irrégulièrement emboitées 15
D
Exemples de l'analyse statistique des expériences de fidélité intermédiaire 19
E
Bibliographie 25

ZOOM ON ... the Requirements department

To comply with a standard, you need to quickly understand its issues in order to determine its impact on your activity.

The Requirements department helps you quickly locate within the normative text:
- mandatory clauses to satisfy,
- non-essential but useful clauses to know, such as permissions and recommendations.

The identification of these types of clauses is based on the document “ISO / IEC Directives, Part 2 - Principles and rules of structure and drafting of ISO documents ”as well as on a constantly enriched list of verbal forms.

With Requirements, quickly access the main part of the normative text!

With Requirements, quickly access the main part of the normative text!

Need to identify, monitor and decipher standards?

COBAZ is the simple and effective solution to meet the normative needs related to your activity, in France and abroad.

Available by subscription, CObaz is THE modular solution to compose according to your needs today and tomorrow. Quickly discover CObaz!

Request your free, no-obligation live demo

I discover COBAZ