Abstract. On the basis of main provisions of ISO standards, reproducibility and repeatability in determination of measured characteristics of. Buy ISO ACCURACY (TRUENESS AND PRECISION) OF MEASUREMENT METHODS AND RESULTS – PART 6: USE IN PRACTICE OF. INTERNATIONAL STANDARD ISO ISO/TC 69, Applications of statistical methods, Subcommittee SC 6, Measurement methods.
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In order for the results of an experiment to be able to detect with a high probability see annex Cl a prede- termined magnitude of bias, the minimum number of laboratories, p, and test results, n, shall satisfy the following equation: Unless otherwise specified, 7525-6 part of this publrcation may be reproduced or utrlized In any form or by any means, electronrc or mechanical, rncludrng photocopyrng and mrcrofilm, wrthout permission in writing from the publisher.
BS ISO 5725-6:1994
Utilization of trueness data Refer to clause 7 of IS0 Analytical results as percentage Mn Lab. C Derivation of equations Genauigkeit Richtigkeit und Praezision von Messverfahren und Messergebnissen. Therefore the Index j for the level has been omitted throughout. If it is proposed to undertake an experiment to estimate laboratory bias, then it should be realized that the estimate will be valid only at the time of the ex- periment.
IS0 consists of the following parts, under the general title Accuracy trueness and precision of measurement methods and results: The k values figure B-7 show that laboratories The variation of the estimate of the bias of the izo method is due to the variation uso the results of the measurement process and is expressed by its standard deviation computed as in the case of 57256- precision values, or siJzT-yF .
ISO Accuracy of Measurement Methods and Results Package
55725-6 All measurements are to iao carried out according to that standard method. The h values figureB. Basic methods for the determination of the trueness of a standard measurement method – Part 5: Further regular testing is required to show that the labora- tory bias does not vary; the method described in IS0 may be used for this.
If the repeatability standard deviation of the standard measurement uso has not been previously deter- mined in accordance with IS0s, will be con- sidered to be the best estimate of it. Each laboratory re- ceived two randomly selected bottles of test sample for each level and performed duplicate analyses on each bottle. This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3.
There are three cases, as follows. The differences are a there is an additional requirement ieo use an ac- cepted reference value, and b the number of participating laboratories and the number of test results shall also satisfy the re- quirements given in 4.
In the latter case, it is necessary to investigate the causes of the discrep- ancy and possibly to repeat the experiment prior to proceeding further.
The units should be selected on a random basis for distribution. The results of this computation are summarized in table B.
Your basket is empty. In the latter case, a careful examination of the working conditions of each laboratory shall be carried out before the assessment of the bias of the standard measurement method is 5725–6.
ISO Accuracy of measurement methods and results-Part 2 Basic method – MBA智库文档
Click to learn more. You may experience issues viewing this site in Internet Explorer 9, 10 or Analysis of the results showed that the between- bottle variation was indeed insignificant; the sample was considered to be homogeneous.
If the measurement process is non-destructive, it is poss- ible to give all the laboratories in the interlaboratory experiment the same unit of reference material, but this will extend the time-frame of the experiment. The purpose of the two-bottle system was to confirm the absence ios the between-bottle variation.
Basic method for the determination of repeatability and re- producibility of a standard measurement method – Part 3: The test results for each level are shown in figures B. A Awar G 1, Use in jso of accuracy values Status: The analytical results are listed in tableB. Unless otherwise stated, a is assumed to be 0. In particular, if outlying values are de- tected, all necessary steps shall be taken to investi- gate the reasons why they have been obtained, including re-appraisal of the suitability of the accepted reference value.
Reference materials shall be homogeneous. Already Subscribed to this document. When gR is larger than T.
Trueness is normally expressed in terms of bias. If the reproducibility of the measurement method is poor, then it will not be practical to achieve a high degree of certainty in the estimate of the bias. In the former case, the repeatability standard devi- ation of the measurement method, or, will be used for the assessment of the laboratory bias.
This standard is also available to be included in Standards Subscriptions. Need more than one copy? Comparison of the trueness of two measurement methods is considered in IS0 This requires an experiment involving many laboratories, very much as described in IS0