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DD ISO/TS 21748:2004

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Guidance for the use of repeatability, reproducibility and trueness estimates in measurement uncertainty estimation
Available format(s)

Hardcopy , PDF

Superseded date

30-11-2010

Language(s)

English

Published date

19-07-2004

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Principles
   5.1 Individual results and measurement process performance
   5.2 Applicability of reproducibility data
   5.3 Basic equations for the statistical model
   5.4 Repeatability data
6 Evaluating uncertainty using repeatability, reproducibility
   and trueness estimates
   6.1 Procedure for evaluating measurement uncertainty
   6.2 Differences between expected and actual precision
7 Establishing the relevance of method performance data to
   measurement results from a particular measurement process
   7.1 General
   7.2 Demonstrating control of the laboratory component of
        bias
   7.3 Verification of repeatability
   7.4 Continued verification of performance
8 Establishing relevance to the test item
   8.1 General
   8.2 Sampling
   8.3 Sample preparation and pre-treatment
   8.4 Changes in test-item type
   8.5 Variation of uncertainty with level of response
9 Additional factors
10 General expression for combined standard uncertainty
11 Uncertainty budgets based on collaborative study data
12 Evaluation of uncertainty for a combined result
13 Expression of uncertainty information
   13.1 General express
   13.2 Choice of coverage factor
14 Comparison of method performance figures and uncertainty
   data
   14.1 Basic assumptions for comparison
   14.2 Comparison procedure
   14.3 Reasons for differences
Annex A (informative) Approaches to uncertainty estimation
Annex B (informative) Experimental uncertainty evaluation
Annex C (informative) Examples of uncertainty calculations
Bibliography

Provides guidance for the evaluation of measurement uncertainties using data obtained from studies conducted in accordance with ISO 5725-2, and for the comparison of collaborative study results with measurement uncertainty obtained using formal principles of uncertainty propagation. Applicable in all measurement and test fields where an uncertainty associated with a result has to be determined.

Committee
SS/6
DocumentType
Standard
Pages
40
PublisherName
British Standards Institution
Status
Superseded
SupersededBy

Standards Relationship
ISO/TS 21748:2004 Identical

ISO/IEC 17025:2005 General requirements for the competence of testing and calibration laboratories
ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions
ISO/IEC Guide 43-1:1997 Proficiency testing by interlaboratory comparisons Part 1: Development and operation of proficiency testing schemes
ISO 5725-3:1994 Accuracy (trueness and precision) of measurement methods and results — Part 3: Intermediate measures of the precision of a standard measurement method
ISO Guide 33:2015 Reference materials Good practice in using reference materials
FD X07 021 : 99 FD FUNDAMENTAL STANDARDS - METROLOGY AND APPLICATION OF THE STATISTICS - HELP TO THE PROCESS FOR THE ESTIMATION AND THE USE OF THE MEASUREMENT AND TEST RESULTS UNCERTAINTY
ISO 5725-6:1994 Accuracy (trueness and precision) of measurement methods and results — Part 6: Use in practice of accuracy values
ISO 5725-4:1994 Accuracy (trueness and precision) of measurement methods and results Part 4: Basic methods for the determination of the trueness of a standard measurement method
ISO 3534-2:2006 Statistics Vocabulary and symbols Part 2: Applied statistics
ISO 5725-2:1994 Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
ISO 3534-3:2013 Statistics — Vocabulary and symbols — Part 3: Design of experiments
ISO/IEC Guide 43-2:1997 Proficiency testing by interlaboratory comparisons Part 2: Selection and use of proficiency testing schemes by laboratory accreditation bodies
ISO/TR 7871:1997 Cumulative sum charts Guidance on quality control and data analysis using CUSUM techniques
ISO 5725-5:1998 Accuracy (trueness and precision) of measurement methods and results — Part 5: Alternative methods for the determination of the precision of a standard measurement method
ISO 3534-1:2006 Statistics — Vocabulary and symbols — Part 1: General statistical terms and terms used in probability

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