This document gives guidance for<\/p>\n
evaluation of measurement uncertainties using data obtained from studies conducted in accordance with ISO 5725\u20112, and<\/p>\n<\/li>\n
comparison of collaborative study results with measurement uncertainty (MU) obtained using formal principles of uncertainty propagation (see Clause 14).<\/p>\n<\/li>\n<\/ul>\n
ISO 5725\u20113 provides additional models for studies of intermediate precision. However, while the same general approach may be applied to the use of such extended models, uncertainty evaluation using these models is not incorporated in this document.<\/p>\n
This document is applicable to all measurement and test fields where an uncertainty associated with a result has to be determined.<\/p>\n
This document does not describe the application of repeatability data in the absence of reproducibility data.<\/p>\n
This document assumes that recognized, non-negligible systematic effects are corrected, either by applying a numerical correction as part of the method of measurement, or by investigation and removal of the cause of the effect.<\/p>\n
The recommendations in this document are primarily for guidance. It is recognized that while the recommendations presented do form a valid approach to the evaluation of uncertainty for many purposes, it is also possible to adopt other suitable approaches.<\/p>\n
In general, references to measurement results, methods and processes in this document are normally understood to apply also to testing results, methods and processes.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 2<\/td>\n | National foreword <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | Foreword <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | Introduction <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 4 Symbols <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5 Principles 5.1 Individual results and measurement process performance 5.2 Applicability of reproducibility data <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 5.3 Basic equations for the statistical model <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 5.4 Repeatability data 6 Evaluating uncertainty using repeatability, reproducibility and trueness estimates 6.1 Procedure for evaluating measurement uncertainty <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 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 7.2.1 General requirements 7.2.2 Methods of demonstrating control of the laboratory component of bias <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 7.2.3 Detection of significant 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 <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 8.2 Sampling 8.2.1 Inclusion of sampling process 8.2.2 Inhomogeneity 8.3 Sample preparation and pre-treatment 8.4 Changes in test-item type 8.5 Variation of uncertainty with level of response 8.5.1 Adjusting sR <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 8.5.2 Changes in other contributions to uncertainty 9 Additional factors <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 10 General expression for combined standard uncertainty 11 Uncertainty budgets based on collaborative study data <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 12 Evaluation of uncertainty for a combined result 13 Expression of uncertainty information 13.1 General expression 13.2 Choice of coverage factor 13.2.1 General 13.2.2 Level of confidence desired 13.2.3 Degrees of freedom associated with the estimate <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 14 Comparison of method performance figures and uncertainty data 14.1 Basic assumptions for comparison 14.2 Comparison procedure <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | 14.3 Reasons for differences <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Annex\u00a0A (informative) Approaches to uncertainty evaluation <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | Annex\u00a0B (informative) Experimental uncertainty evaluation <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | Annex\u00a0C (informative) Examples of uncertainty calculations <\/td>\n<\/tr>\n | ||||||
| 47<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Guidance for the use of repeatability, reproducibility and trueness estimates in measurement uncertainty evaluation<\/b><\/p>\n |