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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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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. If the document is revised or amended, you will be notified by email. Need more than one copy? Analytical results as percentage Mn Lab.

BS ISO 5725-6:1994

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The symbols used in IS0 are given in annex A. 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.

Exactitude justesse et fidelite des resultats et methodes de mesure. Apart from the restriction to a single laboratory. The units should be selected on a random basis for distribution.

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It may appear that 5725–6 laboratories did not use the required equipment or did not work ac- cording to the specified conditions. Click to learn more. The number of laboratories to be used is discussed in subclause 6.

Utilisation dans la pratique des valeurs d’exactitude.

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Unless otherwise stated, a is assumed to be 0. If 575-6, what are the improvements required? It also specifically provides a procedure for obtaining intermediate measures of precision, basic methods for the determination of the trueness of a measurement method, the determination of repeatability and reproducibility of a standard measurement method. Genauigkeit Richtigkeit und Praezision von Messverfahren und Messergebnissen. The trueness of the measurement method can be investigated by comparing 575-6 accepted reference value with the level of the results given by the measurement 57255-6.

Basic methods for the determination of the trueness of a standard measurement method – Part 5: 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. Please first verify your email before subscribing to alerts. The purpose of the two-bottle system was to confirm the absence of the between-bottle variation.

ISO Accuracy of Measurement Methods and Results Package

Do the results of the accuracy experiment justify the acceptability of the measurement method for adoption as a standard? You may find similar items within these categories by selecting from the choices below:. The work of preparing International Standards is normally carried out through IS0 technical committees. 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.

Analysis of the results showed that the between- ios variation was indeed insignificant; the sample was considered to be homogeneous. 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. Bias can arise, for example, in chemical analysis if the measurement method fails to extract all of an element, or if the presence of one element interferes with the determination of another.

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The ISO Accuracy of Measurement Methods and Results Package provides the general principles necessary to accurately assess measurement methods, results, applications and practical estimations. Relevant International Standards on sample division should be consulted. The first condition is actually developed in 4. The variation of the estimate of the bias of the measurement method is due to the variation in 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 .

What action should be taken with respect to re- jected outlying laboratories? Basic method for the determination of repeatability and re- producibility of a standard measurement method – Part 3: The k values figure B-7 show that laboratories If the repeatability standard deviation, or, of the stan- dard measurement method is known, the estimate s, can be assessed by the following procedure.

Comparison of the trueness of two 5725-66 methods is considered in IS0 The laboratory bias is further considered in IS0 Utilisation dans la pratique des valeurs d’exactitude Title in German Genauigkeit Richtigkeit und Praezision von Messverfahren und Messergebnissen. What action is to be taken concerning its publication? IAccuracy trueness and precision of measurement methods and results – Part 1: Al- though, for some measurement methods, the true value cannot be known exactly, it may be possible to have an accepted reference value for the property being is for example, if suitable reference materials are available, or if the accepted reference value can be established by refer- ence to another measurement method or by preparation of a known sample.