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BS ISO 5725-4:2020

BS ISO 5725-4:2020

$167.15

Accuracy (trueness and precision) of measurement methods and results – Basic methods for the determination of the trueness of a standard measurement method

Published By Publication Date Number of Pages
BSI 2020 36
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1.1

This document

  • specifies basic methods for estimating the bias of a measurement method and the laboratory bias when a measurement method is applied;

  • provides a practical approach of a basic method for routine use in estimating the bias of measurement methods and laboratory bias;

  • provides a brief guidance to all personnel concerned with designing, performing or analysing the results of the measurements for estimating bias.

1.2

It is concerned exclusively with measurement methods which yield measurements on a continuous scale and give a single value as the measurement result, although the single value can be the outcome of a calculation from a set of observations.

1.3

This document applies when the measurement method has been standardized and all measurements are carried out according to that measurement method.

NOTE In ISO/IEC Guide 99:2007(VIM), “measurement procedure” (2.6) is an analogous term related to the term “measurement method” used in this document.

1.4

This document applies only if an accepted reference value can be established to substitute the true value by using the value, for example:

  • of a suitable reference material;

  • of a suitable measurement standard;

  • referring to a suitable measurement method;

  • of a suitable prepared known sample.

1.5

This document applies only to the cases where it is sufficient to estimate bias on one property at a time. It is not applicable if the bias in the measurement of one property is affected by the level of any other property (i.e. it does not consider interferences by any influencing quantity). Comparison of the trueness of two-measurement methods is considered in ISO 5725‑6.

PDF Catalog

PDF Pages PDF Title
2 undefined
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
10 3 Terms and definitions
4 Symbols
11 5 Determination of the bias of a standard measurement method by an interlaboratory experiment
5.1 Experimental design considerations
5.1.1 Objective
12 5.1.2 Layout of the experiment
5.1.3 Cross-references to ISO 5725-1 and ISO 5725-2
5.2 The statistical model
5.3 Required number of laboratories and measurements
14 5.4 Requirements of the accepted reference value
5.4.1 Approaches to assigning the accepted reference value
5.4.2 Materials used in the experiment
15 5.4.3 Requirements of measurement uncertainty of the accepted reference value
16 5.5 Carrying out the experiment
5.5.1 Evaluation of precision
5.5.2 Check of precision
18 5.5.3 Estimation of the bias of the standard measurement method
5.5.4 Example
6 Determination of the laboratory bias of one laboratory using a standard measurement method
6.1 Experimental design considerations
6.1.1 Objective
6.1.2 Layout of the experiment
19 6.1.3 Cross-references to ISO 5725-1 and ISO 5725-2
6.2 The statistical model
6.3 Number of measurement results
20 6.4 Requirements of the accepted reference values
6.5 Carrying out the experiment
6.5.1 Check of the within-laboratory standard deviation
21 6.5.2 Estimation of the laboratory bias
22 7 Report to the panel and decisions to be taken by the panel
7.1 Cross-reference to ISO 5725-2
7.2 Report by the statistical expert
7.3 Decisions by the panel
23 Annex A (informative) Derivation of formulae
26 Annex B (informative) Example of an accuracy experiment
34 Bibliography

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BS ISO 5725-4:2020
$167.15