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