BS 5497-1:1987

National foreword
Committees responsible
Method
0. Introduction
1. Scope
2. Field of application
Section one: General principles
3. Quantitative definitions of repeatability and
     reproducibility of a standard test method
4. Practical implications of the definitions
5. Statistical model
6. Design of a precision experiment
7. Analysis of the data
Section two: Organization of an inter-laboratory
precision experiment
8. Personnel requirements
9. Tasks and problems
10. Comments on clauses 8 and 9
Section three: Statistical analysis of the results of
and inter-laboratory experiment
11. Preliminary considerations
12. Cochran's test
13. Dixon's test
14. Computation of the mean level m, the repeatability
     r and the reproducibility R
15. Establishing a functional relationship between r
     (or R) and m
16. Statistical analysis as a step-by-step procedure
17. Reporting to, and decisions to be taken by, the
     panel
Section four: Utilization of precision data
18. Publication of repeatability and reproducibility
     values
19. Other critical differences derivable from r and R
20. Practical applications
Section five: Examples
21. General information
22. Uniform-level experiment with no missing or
     outlying data
23. Uniform-level experiment with missing data
24. Uniform-level experiment with outlying data
25. Split-level experiment with a single level
Annexes
A. Critical values for Cochran's test
B. Critical values for Dixon's test
C. Symbols and subscripts
Bibliography

Defines numerically repeatability and reproducibility, discusses their implications and presents practical rules for their interpretation. Describes the organization and analysis of single inter-laboratory experiments for numerical determination of repeatability and reproducibility. Applies to test methods that are already standardized and whose results are expressed quantitatively. May also be used to assess the precision of a new test method still under development.