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BS ISO 5725-2:2019 Accuracy (trueness and precision) of measurement methods and results - Basic method for the determination of repeatability and reproducibility of a standard measurement method >
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BS ISO 5725-2:2019 Accuracy (trueness and precision) of measurement methods and results - Basic method for the determination of repeatability and reproducibility of a standard measurement method, 2019
- undefined
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols
- 5 Estimates of the parameters in the basic model
- 6 Requirements for a precision experiment
- 6.1 Layout of the experiment
- 6.2 Recruitment of the laboratories
- 6.3 Preparation of the materials
- 7 Personnel involved in a precision experiment
- 7.1 Panel
- 7.2 Statistical functions
- 7.3 Executive functions
- 7.4 Supervisors
- 7.5 Operators
- 8 Statistical analysis of a precision experiment
- 8.1 Preliminary considerations
- 8.2 Tabulation of the results and notation used
- 8.2.1 Cells
- 8.2.2 Redundant data
- 8.2.3 Missing data
- 8.2.4 Outliers
- 8.2.5 Outlying laboratories
- 8.2.6 Erroneous data
- 8.2.7 Balanced uniform-level test results
- 8.2.8 Collation of data and intermediate values
- 8.2.9 Original test results
- 8.2.10 Cell means (Form B of Figure 2)
- 8.2.11 Measures of cell spread (Form C of Figure 2)
- 8.2.12 Corrected or rejected data
- 8.3 Scrutiny of results for consistency and outliers
- 8.3.1 Approaches for scrutiny of data
- 8.3.2 Graphical consistency technique
- 8.3.3 Numerical outlier technique
- 8.3.4 Cochran’s test
- 8.3.5 Grubbs’ tests
- 8.3.6 Repeated testing for outlying means or outlying data points
- 8.3.7 Alternative outlier inspection and test methods
- 8.4 Calculation of the general mean and variances
- 8.4.1 Method of analysis
- 8.4.2 Basic data
- 8.4.3 Non-empty cells
- 8.4.4 Calculation of the general mean, 
- 8.4.5 Calculation of variances
- 8.4.6 Alternative calculation methods for variances
- 8.4.7 Dependence of the variances upon m
- 8.5 Establishing a functional relationship between precision values, s, and the mean level, m
- 8.5.1 Choice of functional relationship
- 8.5.2 Fitting relationships I and II
- 8.5.3 Fitting relationship III
- 8.5.4 Fitting relationship IV
- 8.6 Statistical analysis as a step-by-step procedure
- 8.7 Report to the panel and decisions to be taken by the panel
- 8.7.1 Report by the statistical expert
- 8.7.2 Decisions to be taken by the panel
- 8.7.3 Full report
- 9 Statistical tables
- Annex A (informative) Number of laboratories required for an estimate of precision
- Annex B (informative) Alternative calculations of variance components
- Annex C (informative) Examples of the statistical analysis of precision experiments
- Annex D (informative) Calculation of critical values and indicators
- Bibliography [Go to Page]