BS-ISO-5725-2-1994.pdf
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1、BRITISH STANDARD BS ISO 5725-2:1994 Incorporating Technical Corrigendum No. 1 Implementation of ISO 5725-2:1994 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 ICS 03
2、.120.30 ? Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 01:53:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 5725-2:1994 This British Standard, having been prepared under the direction of the Management Systems Sector Board, was published under the authority of the Standards Board and
3、 comes into effect on 15 April 1995 BSI 12 November 2002 The following BSI references relate to the work on this standard: Committee reference QMS/16 Draft for comment 90/97779 DC ISBN 0 580 24033 9 Committees responsible for this British Standard The preparation of this British Standard was entrust
4、ed to Technical Committee QMS/16, Precision of test methods, upon which the following bodies were represented: British Gas plc Chemical Industries Association Consumers Association Department of Trade and Industry (Laboratory of the Government Chemist) Department of Trade and Industry (National Phys
5、ical Laboratory) Institute of Quality Assurance Ministry of Agriculture, Fisheries and Food Ministry of Defence Royal Society of Chemistry University of London Amendments issued since publication Amd. No.DateComments 13997 Technical Corrigendum No. 1 12 November 2002 Addition of note to 7.3.4.3 and
6、Table 5 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 01:53:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 5725-2:1994 BSI 12 November 2002 i Contents Page Committees responsibleInside front cover National foreword ii Forewordiv Text of ISO 5725-21 Licensed Copy: sheffieldun sheffield
7、un, na, Sun Nov 26 01:53:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 5725-2:1994 ii BSI 12 November 2002 National foreword This British Standard reproduces verbatim ISO 5725-3:1994, including technical corrigendum May 2002, and implements it as the UK national standard. Parts 1 to 6 of BS I
8、SO 5725 together supersede BS 5497-1:1987 which will be withdrawn upon the publication of BS ISO 5725-5. This British Standard is published under the direction of the Management Systems Sector Board whose Technical Committee QMS/16 has the responsibility to: aid enquirers to understand the text; pre
9、sent to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. Cross-references The British Standards which implement international public
10、ations referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the nece
11、ssary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO title page, pages ii
12、 to iv, pages 1 to 52, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 01:53:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Technical corrigendum 2002-05-15 L
13、icensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 01:53:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 5725-2:1994 ii BSI 12 November 2002 Contents Page Forewordiv 1 Scope3 2 Normative references3 3 Definitions4 4 Estimates of the parameters in the basic model4 5 Requirements for a precision
14、experiment4 5.1 Layout of the experiment4 5.2 Recruitment of the laboratories5 5.3 Preparation of the materials5 6 Personnel involved in a precision experiment7 6.1 Panel7 6.2 Statistical functions7 6.3 Executive functions7 6.4 Supervisors8 6.5 Operators8 7 Statistical analysis of a precision experi
15、ment9 7.1 Preliminary considerations9 7.2 Tabulation of the results and notation used9 7.3 Scrutiny of results for consistency and outliers12 7.4 Calculation of the general mean and variances17 7.5 Establishing a functional relationship between precision values and the mean level m19 7.6 Statistical
16、 analysis as a step-by-step procedure22 7.7 The report to, and the decisions to be taken by, the panel26 8 Statistical tables27 Annex A (normative) Symbols and abbreviations used in ISO 572531 Annex B (informative) Examples of the statistical analysis of precision experiments33 B.1 Example 1: Determ
17、ination of the sulfur content of coal (Several levels with no missing or outlying data)33 B.2 Example 2: Softening point of pitch (Several levels with missing data)40 B.3 Example 3: Thermometric titration of creosote oil (Several levels with outlying data)46 Annex C (informative) Bibliography52 Figu
18、re 1 Enlistment questionnaire for interlaboratory study6 Figure 2 Recommended forms for the collation of results for analysis11 Figure 3 Flow diagram of the principal steps in the statistical analysis24 Figure B.1 Sulfur content of coal, sample 136 Figure B.2 Sulfur content of coal, sample 237 Figur
19、e B.3 Sulfur content of coal, sample 337 Figure B.4 Sulfur content of coal, sample 438 Figure B.5 Softening point of pitch: Cell means44 Figure B.6 Softening point of pitch: Absolute differences within cells45 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 01:53:16 GMT+00:00 2006, Uncontroll
20、ed Copy, (c) BSI ISO 5725-2:1994 BSI 12 November 2002 iii Page Figure B.7 Titration of creosote oil: Mandels between-laboratory consistency statistic, h, grouped by laboratories49 Figure B.8 Titration of creosote oil: Mandels within-laboratory consistency statistic, k, grouped by laboratories50 Figu
21、re B.9 Plot of srj and sRj against , of the data from Table B.16, showing the functional relationships fitted in 7.5 from these data51 Table 1 Relationship I: s = bm21 Table 2 Relationship II: s = a + bm22 Table 3 Relationship III: lg s = c + d lg m22 Table 4 Critical values for Cochrans test27 Tabl
22、e 5 Critical values for Grubbs test28 Table 6 Indicators for Mandels h and k statistics at the 1 % significance level29 Table 7 Indicators for Mandels h and k statistics at the 5 % significance level30 Table B.1 Original data: Sulfur content of coal34 Table B.2 Cell means: Sulfur content of coal35 T
23、able B.3 Standard deviations: Sulfur content of coal35 Table B.4 Application of Grubbs test to cell means39 Table B.5 Computed values of , srj and sRj, for sulfur content of coal39 Table B.6 Original data: Softening point of pitch (?C)41 Table B.7 Cell means: Softening point of pitch (?C)42 Table B.
24、8 Absolute differences within cells: Softening point of pitch (?C)42 Table B.9 Values of Cochrans test statistic, C43 Table B.10 Application of Grubbs test to cell means43 Table B.11 Computed values of , sRj and srj for softening point of pitch43 Table B.12 Original data: Thermometric titration of c
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