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BS ISO 13528:2022 – TC:2024 Edition

BS ISO 13528:2022 – TC:2024 Edition

$280.87

Tracked Changes. Statistical methods for use in proficiency testing by interlaboratory comparison

Published By Publication Date Number of Pages
BSI 2024 233
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PDF Catalog

PDF Pages PDF Title
130 National foreword
135 Foreword
136 0 Introduction
139 1 Scope
2 Normative references
3 Terms and definitions
142 4 General principles
4.1 General requirements for statistical methods
143 4.2 Basic model
4.3 General approaches for the evaluation of performance
144 5 Guidelines for the statistical design of proficiency testing schemes
5.1 Introduction to the statistical design of proficiency testing schemes
5.2 Basis of a statistical design
145 5.3 Considerations for the statistical distribution of results
146 5.4 Considerations for small numbers of participants
5.5 Guidelines for choosing the reporting format
5.5.1 General requirements for reporting format
147 5.5.2 Reporting of replicate measurements
5.5.3 Reporting of ‘less than’ or ‘greater than’ a limit (censored data)
5.5.4 Number of significant digits
148 6 Guidelines for the initial review of proficiency testing items and results
6.1 Homogeneity and stability of proficiency test items
149 6.2 Considerations for different measurement methods
6.3 Blunder removal
150 6.4 Visual review of data
6.5 Robust statistical methods
151 6.6 Outlier techniques for individual results
152 7 Determination of the assigned value and its standard uncertainty
7.1 Choice of method of determining the assigned value
7.2 Determining the uncertainty of the assigned value
153 7.3 Formulation
154 7.4 Certified reference material
7.5 Results from one laboratory
155 7.6 Consensus value from expert laboratories
156 7.7 Consensus value from participant results
157 7.8 Comparison of the assigned value with an independent reference value
158 8 Determination of criteria for evaluation of performance
8.1 Approaches for determining evaluation criteria
159 8.2 By perception of experts
8.3 By experience from previous rounds of a proficiency testing scheme
8.4 By use of a general model
160 8.5 Using the repeatability and reproducibility standard deviations from a previous collaborative study of precision of a measurement method
8.6 From data obtained in the same round of a proficiency testing scheme
161 8.7 Monitoring interlaboratory agreement
162 9 Calculation of performance statistics
9.1 General considerations for determining performance
9.2 Limiting the uncertainty of the assigned value
163 9.3 Estimates of deviation (measurement error)
164 9.4 z scores
165 9.5 z′ scores
166 9.6 Zeta scores (ζ)
167 9.7 En scores
168 9.8 Evaluation of participant uncertainties in testing
169 9.9 Combined performance scores
10 Graphical methods for describing performance scores
10.1 Application of graphical methods
170 10.2 Histograms of results or performance scores
10.3 Kernel density plots
172 10.4 Bar-plots of standardized performance scores
10.5 Youden plot
173 10.6 Plots of repeatability standard deviations
174 10.7 Split samples
10.8 Graphical methods for combining performance scores over several rounds of a proficiency testing scheme
175 11 Design and analysis of qualitative proficiency testing schemes (including nominal and ordinal properties)
11.1 Types of qualitative data
176 11.2 Statistical design
11.3 Assigned values for qualitative proficiency testing schemes
178 11.4 Performance evaluation and scoring for qualitative proficiency testing schemes
180 Annex A (normative) Symbols
182 Annex B (informative) Homogeneity and stability of proficiency test items
190 Annex C (informative) Robust analysis
201 Annex D (informative) Additional guidance on statistical procedures
206 Annex E (informative) Illustrative examples
229 Annex F (Informative) Example of computer code for plotting and resampling analysis (“bootstrapping”) of PT results
230 Bibliography

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BS ISO 13528:2022 - TC
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