ISO-5725-2-1994.pdf
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1、INTERNATIONAL STANDARD IS0 5725-211994 TECHNICAL CORRIGENDUM 1 Published 2002-05-1 5 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MMYWOflHAFI OPTAHMWMFI no CTAHWTMWMM ORGANISATION INTERNATIONALE DE NORMALISATION Accuracy (trueness and precision) of measurement methods and results - Part 2: Basic m
2、ethod for the determination of repeatability and reproducibility of a standard measurement method TECHNICAL CORRIGENDUM 1 Exactitude oustesse et fidlit) des rsultats et mthodes de mesure - Partie 2 : Mthode de base pour la dtermination de la rptabilit et de la reproductibilit d?une mthode de mesure
3、normalise RECTIFICATIF TECHNIQUE I Technical Corrigendum 1 to International Standard IS0 5725-2: 1994 was prepared by Technical Committee ISOTC 69, Applications of statistical methods, Subcommittee SC 6, Measurement methods and results. Page 12, subclause 7.3.4.3 Add the following note at the end of
4、 the subclause 7.3.4.3: ?NOTE According to 7.3.2.1, an item is to be called a statistical outlier if the test statistic is greater than its 1 % critical value. When the Grubbs? test is first applied to a group of cell means, a critical value from Table 5 is used to test the highest cell mean using a
5、 test at the 0,5 % level, and to test the lowest cell mean at the 0,5 % level. This amounts to a test of the most extreme cell mean at the 1 % level in accordance with 7.3.2.1. If the most extreme cell mean is found to be a statistical outlier, the Grubbs? test is then applied to the other extreme c
6、ell mean. It can be argued that a one-sided test should now be used. However, the procedure recommended in this part of IS0 5725 is to use only the critical values tabulated in Table 5 (the critical values for two-sided tests at the 1 % significance level) in order that all cell means be treated con
7、sistently. A similar argument may be used to justify the use of the two-sided 5 % critical values in Table 5 for all tests for statistical stragglers.? ICs 03.120.30 O IS0 2002 -All rights reserved Printed in Switzerland Ref. No. IS0 5725-2:1994/Cor.l:2002(E) IS0 5725-2:1994/Cor.l:2002(E) Page 22, T
8、able 5 Add the following note at the end of Table 5: “NOTE The critical values given in this table are appropriate when two-sided tests are required. They are the critical values required by the procedure for applying the Grubbs outlier tests described in 7.3.4 of this part of IS0 5725. They have be
9、en derived from the critical values for the corresponding one-sided tests as given in reference 4 of annex C.” 2 O IS0 2002 -All rights reserved m 4851903 0594509 493 m I NTERNATIONAL STANDARD IS0 5725-2 First edition 1994-1 2-1 5 Accuracy (trueness and precision) of measurement methods and results
10、- Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method Exactitude (juctesse et fidlit) des rsultats et mthodes de mesure - Partie 2: Mthode de base pour la dtermination de la rptabilit et de la reproductibilit dune mthode de mesure normalis
11、e Reference number IS0 5725-2:1994(E) 4853903 0594510 305 IS0 5725-2:1994(E) Contents Page 1 Scope 1 2 Normative references . 2 3 Definitions . 2 4 Estimates of the parameters in the basic model . 2 5 Requirements for a precision experiment 2 5.1 Layout of the experiment . 2 5.2 Recruitment of the l
12、aboratories . 3 5.3 Preparation of the materials . 3 6 Personnel involved in a precision experiment 5 6.1 Panel . 5 6.2 Statistical functions 5 6.3 Executive functions 5 6.4 Supervisors . 5 6.5 Operators 6 7 Statistical analysis of a precision experiment . 6 7.1 Preliminary considerations 6 7.2 Tabu
13、lation of the results and notation used 7 7.3 Scrutiny of results for consistency and outliers . 9 7.4 Calculation of the general mean and variances . 13 7.5 Establishing a functional relationship between precision values and the mean level m . 14 7.6 Statistical analysis as a step-by-step procedure
14、 . 16 7.7 The report to. and the decisions to be taken by. the panel 20 8 Statistical tables 21 O IS0 1994 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 mic
15、rofilm. without permission in writing from the publisher . International Organization for Standardization Case Postale 56 CH-121 1 Genve 20 Switzerland Printed in Switzerland II -,-,- 6 IS0 = 4851903 05945l11 041 = IS0 5725-2:1994(E) Annexes A Symbols and abbreviations used in IS0 5725 . 25 B Exampl
16、es of the statistical analysis of precision experiments 27 B.l Example 1: Determination of the sulfur content of coal (Several levels with no missing or outlying data) . . 27 Example 2: Softening point of pitch (Several levels with missing data) . 32 Example 3: Thermometric titration of creosote oil
17、 (Several levels with outlying data) . 36 6.2 B.3 C Bibliography 42 . 111 IS0 5725-2:1994(EI YB53903 0594532 T B 8 Q IS0 Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International S
18、tandards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, als
19、o take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Internati
20、onal Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 5725-2 was prepared by Technical Committee iSO/TC 69, Applications of statistical methods, Subcommittee SC 6, Measurement methods and results. IS0 5725 consists of the following parts, un
21、der the general title Accuracy (trueness and precision) of measurement methods and results: - Part 7: General principles and definitions - Part 2: Basic method for the determination of repeatability and re- producibility of a standard measurement method measurement method - Part 3: Intermediate meas
22、ures of the precision of a standard - Part4: Basic methods for the determination of the trueness of a standard measurement method - Part 5: Alternative methods for the determination of the precision of a standard measurement method - Part 6: Use in practice of accuracy values Parts 1 to 6 of IS0 572
23、5 together cancel and replace IS0 5725:1986, which has been extended to cover trueness (in addition to precision) and intermediate precision conditions (in addition to repeatability and repro- ducibility conditions). Annex A forms an integral part of this part of IS0 5725. Annexes B and C are for in
24、formation only. iv -,-,- 0 IS0 4853903 0594513 914 W IS0 5725-2:1994(E) I nt rodu ct ion 0.1 IS0 5725 uses two terms “trueness“ and “precision“ to describe the accuracy of a measurement method. “Trueness“ refers to the close- ness of agreement between the arithmetic mean of a large number of test re
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