ISO 5725-2 PDF

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IS0 consists of the following parts, under iao general title Accuracy trueness and precision of measurement methods and results: The h and k values are shown in figures B.

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

You may find similar items within these categories by selecting from the choices below:. Unless otherwise stated, a is assumed to be 0. Worldwide Standards We can source any standard from anywhere in the world. Thus results from each laboratory can be considered as replicates under repeatability conditions. Unless otherwise stated, a is assumed to be 0, 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.

It was therefore decided to discard the results from laboratory 10 completely; it should be the object of special attention, and the matter should be resolved. Do the results of the accuracy experiment justify the acceptability of the measurement method for adoption as a standard? The repeatability and the reproducibility standard de- viations were then computed excluding those data that were discarded.

The laboratory bias is further considered in Ido In the former case, the repeatability standard devi- ation, cr, will be used for the assessment of the bias of the measurement method. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Find Similar Items This product falls into the following categories.

Alternative methods for the iiso nation of the precision of a standard measure- ment method. Company organization, management and quality. Reference materials shall be homogeneous. Relevant International Standards on sample division should be consulted.

When a value for the bias of a measure- ment method is quoted, together with a test result obtained by that method, there is an implication that the same characteristic is being measured in exactly the same way. Intermediate measures of the precision of a standard measurement method. The reference material should have a matrix as close as possible to the matrix of the material to be subjected to the standard measurement method, e. The files of this standards is not available in the store right io.

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The results of this computation are summarized in table B. 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 ios accepted reference value. IS0 l should be read in conjunction with all other parts of IS0including this part, because it gives the underlying definitions and general principles.

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. Learn more about the cookies we use and how to change your settings. 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. Each member body interested 5752-2 a subject for which a technical committee has been established has the right to be represented 572-52 that committee.

Annexes B, C and D are for information only. 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. ixo

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 measured; 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.

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 known precision values, or siJzT-yF 7525-2.

BS ISO 5725-2:1994

Take the smart route to manage medical device compliance. What action should be taken with respect to re- jected outlying laboratories? Laboratory means and laboratory variances Lab. 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 You can buy this standard from any national standardization body.

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Comparison of the trueness of two measurement methods is considered in IS0 In the former case, the repeatability standard devi- ation of the measurement method, or, will be used for the assessment of the laboratory bias. Alternative methods for the determination of the precision of a standard measurement method – Part 6: Please download Chrome or Firefox or view our browser tips.

Analysis of the results showed that the between- bottle variation was indeed insignificant; the sample was considered to be homogeneous. 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, gr, and the reproducibility standard deviation, gR, will be used for the assessment of the trueness of the measurement method.

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What action is to be taken concerning its publication? Accept and continue Learn more about the cookies we use and how to change your settings. To request this FREE document, please email us. 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 ios it.

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C Derivation of equations The number of laboratories to be used is discussed in subclause 6. Accuracy trueness and precision of measurement methods and results — Part 2: In some cases it will be important to include, in the assessment exper- iment, a series of reference materials, each corre- sponding to a different level of the property, as the bias of the standard measurement method may be different at different levels.

The k values figure B-7 show that laboratories Your basket is empty.