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.
|Published (Last):||28 September 2013|
|PDF File Size:||7.7 Mb|
|ePub File Size:||17.65 Mb|
|Price:||Free* [*Free Regsitration Required]|
5752-6 consists of the following parts, under the general title Accuracy trueness and precision of measurement methods and results: You may delete a document from your Alert Profile at any time. Analysis of the results showed that the between- bottle variation was indeed insignificant; the sample was considered to be homogeneous. Prior to conducting the as- sessment of trueness, a check of the precision of the standard measurement method as applied by the lab- oratory shall be performed.
As a result the experiment may have to be repeated to yield the expected preci- sion values.
Enoval – References
C Derivation of equations Basic method for the determination of repeatability and re- producibility of a standard measurement method. Isp implies comparison between the within-laboratory standard deviation and the stated repeatability standard deviation of the standard measurement method.
Reference materials shall be homogeneous. Proceed to Checkout Continue Shopping. Please first verify your email before subscribing to alerts. Alternative methods 57225-6 the determi- nation of the precision of a standard measure- ment method. IS0 l should be read in conjunction with all other parts of IS0including this part, because it gives the underlying definitions and general principles.
The linear regression equations of the repeatability and reproducibility standard deviations versus levels of concentration are: Use in practice of accuracy values Status: Laboratory means and laboratory variances Lab.
Utilisation dans la pratique des valeurs d’exactitude. If the repeatability standard deviation of the standard measurement method has not been previously deter- mined in accordance with IS0s, will be con- sidered to be the best estimate of it. If this is not true, the respective equations given in IS0 should be used to calculate s. In this report the following information shall be given: Subscription pricing is determined by: The laboratory means and vari- ances for each of the five test materials are listed in table 8.
Basic methods for the determination of the trueness of a standard measurement method 1 Scope 1. In the former case, the repeatability standard devi- ation, gr, and the reproducibility standard deviation, gR, will be used for the assessment of the trueness of the measurement method. It also specifically provides a procedure for obtaining intermediate measures of precision, basic methods for the determination of the trueness of a measurement method, iao determination of repeatability and reproducibility of a standard measurement method.
Your Alert Profile lists the documents that will be monitored. It was therefore decided iao discard the results from laboratory 10 completely; it should be the object of special attention, and the matter should be resolved. Unless otherwise stated, a is assumed to be 0. One laboratory re- sult was identified as a straggler; it originated from the same laboratory Is. If the document is revised or amended, you will be notified by email.
The trueness of the measurement method can be investigated by comparing the accepted reference value with the level of the results given by the measurement method. Please download Chrome or Firefox or view our browser tips. 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: Therefore the Index j for the level has been omitted throughout.
All measurements are to be carried out according to that standard method. 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. The purpose of the two-bottle system was to confirm the absence of the between-bottle variation. If the repeatability 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 of the laboratory.
The differences are a there is an additional requirement to 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. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server.
The analytical results are listed in tableB.
BS ISO 5725-6:1994
Click to learn more. If so, what are the improvements required? The h and k values are shown in figures B. All standards are subject to revision, and parties to agreements based on this part of IS0 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
Apart from the restriction to a single laboratory. Calibration-different Equipment-different Identifier for a particular laboratory Identifier for intermediate measures of precision; in brackets, identification of the type of intermediate situation ldentif ier for a particular level IS0 The boxed points in figures B.
NBN ISO 5725-6
Comparison of the trueness of two measurement methods is considered in IS0 Annexes B, C and D are for information only. The work of preparing International Standards is normally carried out through IS0 technical committees. Already Subscribed to this document. Please first isso in with a verified email before subscribing to alerts. Accuracy trueness and precision of measurement methods and results.
Relevant International Standards on sample division should be consulted. Accept and continue Learn more about the cookies we use and how to change your settings.
Unless otherwise specified, no 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.