SANS 5725-3-2009 Accuracy (trueness and precision) of measurement methods and results Part 3 Intermediate measures of the precision of a standard measurement method《测量方法及结果的精度(真实度及.pdf
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1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22661-9 SANS 5725-3:2009Edition 1 and ISO tech. corr. 1ISO 5725-3:1994Edition 1 and tech. corr. 1SOUTH AFRICAN NATIONAL STANDARD Accuracy
4、(trueness and precision) of measurement methods and results Part 3: Intermediate measures of the precision of a standard measurement method This national standard is the identical implementation of ISO 5725-3:1994 and ISO technical corrigendum 1, and is adopted with the permission of the Internation
5、al Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 5725-3:2009 Edition 1 and ISO tech. corr. 1 ISO 5725-3:1994 Edition 1 and tech. corr. 1 Table of cha
6、nges Change No. Date Scope ISO tech. corr. 1 2001 Corrected to change formulas for the ANOVA table for a four-factor fully-nested experiment and the ANOVA table for a four-factor staggered-nested experiment. National foreword This South African standard was approved by National Committee SABS TC 169
7、, Applications of statistical methods, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in August 2009. ICS 03.120.30 Ref. No. ISO 5725-3:1994/Cor.1:2001(E) ISO 2001 All rights reserved Printed in Swit
8、zerland INTERNATIONAL STANDARD ISO 5725-3:1994 TECHNICAL CORRIGENDUM 1 Published 2001-10-15 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATIONAccuracy (trueness and precision) of measurement methods and results Part 3: Intermediate measures of the precision o
9、f a standard measurement method TECHNICAL CORRIGENDUM 1 Exactitude (justesse et fidlit) des rsultats et mthodes de mesure Partie 3: Mesures intermdiaires de la fidlit dune mthode de mesure normalise RECTIFICATIF TECHNIQUE 1 Technical Corrigendum 1 to International Standard ISO 5725-3:1994 was prepar
10、ed by Technical Committee ISO/TC 69, Applications of statistical methods, Subcommittee SC 6, Measurement methods and results. Page 14, 4th and 5th lines below Table B.2 Replace ()2(1)1“MS2MS1”4s = with ()2(1)1“MS1MS2”.4s = Replace ()2(2)1“MS1MSe”2s = with ()2(2)1“MS2MSe”.2s = Page 17, Table C.2, col
11、umn “Sum of squares” for “Source 0” Replace () ()2 2(2)“4 4 ”iiypywith () ()2 2(3)“4 4 ”.iiypySANS 5725-3:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .SANS 5725-3:2009This standard may only be used and printed by approved subscription
12、and freemailing clients of the SABS .INTERNATIONAL STANDARD Is0 5725-3 First edition 1994-12-15 Accuracy (trueness and precision) of measurement methods and results - Part 3: Intermediate measures of the precision of a standard measurement method Exactitude (justesse et fide/S) des r b) the equipmen
13、t used; c) the calibration of the equipment; e) f 1 the environment (temperature, humidity, air pollution, etc.); the batch of a reagent; the time elapsed between measurements. The variability between measurements performed by different operators and/or with different equipment will usually be great
14、er than the variability between measurements carried out within a short interval of time by a single operator using the same equipment. 0.4 Two conditions of precision, termed repeatability and reproducibility conditions, have been found necessary and, for many practical cases, useful for describing
15、 the variability of a measurement method. Under re- peatability conditions, factors a) to f) in 0.3 are considered constants and do not contribute to the variability, while under reproducibility conditions they vary and do contribute to the variability of the test results. Thus re- peatability and r
16、eproducibility conditions are the two extremes of pre- cision, the first describing the minimum and the second the maximum variability in results. Intermediate conditions between these two extreme conditions of precision are also conceivable, when one or more of factors V SANS 5725-3:2009This s tand
17、ard may only be used and printed by approved subscription and freemailing clients of the SABS .IS0 57253: 1994(E) 0 IS0 a) to f) are allowed to vary, and are used in certain specified circum- stances. Precision is normally expressed in terms of standard deviations. 0.5 This part of IS0 5725 focuses
18、on intermediate precision measures of a measurement method. Such measures are called intermediate as their magnitude lies between the two extreme measures of the precision of a measurement method: repeatability and reproducibility standard de- viations. To illustrate the need for such intermediate p
19、recision measures, consider the operation of a present-day laboratory connected with a production plant involving, for example, a three-shift working system where measurements are made by different operators on different equipment. Operators and equipment are then some of the factors that contribute
20、 to the variability in the test results. These factors need to be taken into ac- count when assessing the precision of the measurement method. 0.6 The intermediate precision measures defined in this part of IS0 5725 are primarily useful when their estimation is part of a procedure that aims at devel
21、oping, standardizing, or controlling a measurement method within a laboratory. These measures can also be estimated in a specially designed interlaboratory study, but their interpretation and appli- cation then requires caution for reasons explained in 1.3 and 9.1. 0.7 The four factors most likely t
22、o influence the measurement method are the following. precision of a a) Time: whether the time interval between successive measurements is short or long. b) d Calibration: whether the same equipment is or is not recalibrated between successive groups of measurements. Operator: whether the same or di
23、fferent operators carry out the suc- cessive measurements. d) Equipment: whether the same or different equipment (or the same or different batches of reagents) is used in the measurements. 0.8 It is, therefore, advantageous to introduce the following M-factor- different intermediate precision condit
24、ions (M = 1, 2, 3 or 4) to take ac- count of changes in measurement conditions (time, calibration, operator and equipment) within a laboratory. a) M = 1: only one of the four factors is different; b) M = 2: two of the four factors are different; c) M = 3: three of the four factors are different; d)
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