ISO 5725-4 PDF

DS/ISO Accuracy (trueness and precision) of measurement methods and results – Part 4: Basic methods for estimating the trueness of a standard. ISO Accuracy (Trueness and Precision) of Measurement Methods and Results – Part 4: Basic Methods for the Determination of the Trueness of a. Buy DS ISO ACCURACY (TRUENESS AND PRECISION) OF MEASUREMENT METHODS AND RESULTS – PART 4: BASIC METHODS FOR.

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FAQ What is standard Become a member? General principles and definitions – Part 2: Accuracy trueness and precision of measurement methods and results. Click isoo learn more. This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3.

Annexes B, C and D are for information only. In the latter lso, 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 undertaken. The number of laboratories to be used is discussed in subclause 6.

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Isk materials could be either a certified reference materials; b materials manufactured for the purpose of the experiment with known properties; or c materials whose properties have been established by measurements using an alternative measure- ment method whose bias is known to be negligi- ble.

Methodes de base pour la determination de la justesse d’une methode de mesure normalisee. The laboratory bias is further 572-4 in IS0 The purpose of the two-bottle system was to confirm the absence of the between-bottle variation.

One laboratory re- sult was identified as a straggler; it originated from the same laboratory Lab. However, for practical reasons, the choice of the number of laboratories is usually a compromise between the availability of re- sources and the desire to reduce the value of 6, to a satisfactory level. Accuracy, Precision, Reproducibility, Statistical testing, Measurement characteristics, Testing conditions, Bias, Laboratory testing, Mathematical models, Variance, Mathematical calculations, Outliers, Curve fitting, Estimation, Statistical methods of analysis, Order statistics, Experimental data, Experimental design, Data analysis, Errors, Equations.

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In order for 57254- 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: If u, is un- known, its estimate s. We use cookies to make our website easier to use and to better understand your needs.

ISO Accuracy of measurement methods and results-Part 2 Basic method – MBA智库文档

A Awar G 1, 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. Genauigkeit Richtigkeit und Praezision von Messverfahren und Messergebnissen.

The first condition is actually developed in 4. Exactitude justesse et fidelite des resultats et methodes de mesure. Alternative methods for the determination of the precision of a standard measurement method – Part 6: As a result the experiment may have to be repeated to yield the expected preci- sion values. If the bias is found to be statistically insignif- icant, then the objective is to determine the magnitude of the maximum bias that would, with a certain probability, remain undetected by the results of the experiment.

The work of preparing International Standards is normally carried out through IS0 technical committees. Basic methods for the determination of the trueness of a standard measurement method. It is 55725-4 applicable if the bias in the measurement of one property is ido by the level of a second property i.

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Annex A forms an integral part of this part of IS0 About Us Info center Standardization. In the former case, the repeatability standard devi- ation, gr, and the reproducibility 57254 deviation, gR, will be used for the assessment of the trueness of the measurement method.

Each laboratory re- ceived two randomly selected bottles of test sample for each level and performed duplicate analyses on each bottle. The repeatability and the reproducibility standard de- viations were then computed excluding those data that were discarded.

When gR is larger than T.

BS ISO 5725-4:1994

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. 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.

Each member body interested in a subject jso which a technical committee has been established has the right to be 57254 on that committee. Accept and continue Learn more about the cookies we use and how to change your settings.

Methodes de base pour la 572-54 de la justesse d’une methode de mesure normalisee Title in German Genauigkeit Richtigkeit und Praezision von Messverfahren und Messergebnissen.