ISO INTERNATIONAL STANDARD 5725-6 First edition 1994-12-15 Accuracy (trueness and precision) of measurement methods and results Part 6: Use in practice of accuracy values Exactitude (justesse et fidelite) des résultats et methodes de mesure - Partie 6: Utilisation dans la pratique des valeurs d'exactitude ISO Referencenumber ISO 5725-6:1994(E) ISO 5725-6:1994(E) Contents Page 1 Scope 2 Normative references 3 Definitions 2 4 Determination of limits 2 4.1 Repeatabilityand reproducibility limits 2 4.2 Comparisons based on more than two values 5 Methods for checking the acceptability of test results and determining the final quoted resuit 5.1 General 5.2 Methods for checking the acceptability of test results obtained underrepeatabilityconditions 5.3 Methods for checking the acceptability of test results obtained under both repeatability and reproducibility conditions 6 Method for checking the stability of test results within a laboratory 13 6.1 Background 13 6.2 Methods for checking stability 13 7 Use of repeatability and reproducibility standard deviations in assessing laboratories 25 7.1 Assessment method 25 7.2 Evaluation of the use of a measurement method by a laboratory not previously assessed 26 7.3 Continued assessment of previously approved laboratories 29 Comparison of alternative measurement methods 32 8.1 Origin of alternative measurement methods 32 8.2 Purpose of comparing measurement methods 32 8.3 Method B is a candidate for an alternative standard method ("Standardization experiment" not defined) 33 CISO1994 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International OrganizationforStandardization Case Postale 56:CH-1211 Geneve 20Switzerland Printed in Switzerland ii ISO ISO5725-6:1994(E) 8.4 Accuracy experiment 33 8.5 Method B is a candidate for a routine method 38 Annex A Symbols and abbreviations used in ISO 5725 40 ili