BS EN ISO 4259-3:2020
$142.49
Petroleum and related products. Precision of measurement methods and results – Monitoring and verification of published precision data in relation to methods of test
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 24 |
This document specifies the methodology for the regular monitoring of the test method precision achieved versus the precision published in the standard test method using data from proficiency testing schemes (PTSs) supported by the regular users of standard test methods.
The procedures in this document are designed specifically for proficiency testing (PT) conducted on standard test methods, having a published reproducibility, for petroleum and petroleum-related products, which are presumed to be homogeneous, and where the data distribution is approximately normal. In addition, it is applicable to properties of interest that are (known to be) stable over time and transport.
This document specifies the methodology for the statistical comparison of standard deviation under reproducibility conditions achieved in PT programmes versus that published.
The purpose of this comparison is to find out if the published reproducibility precision is representative of that achievable by the regular participants in the PT programmes.
This document also provides guidance on how to use a PT z-score to monitor an individual participant’s performance over time (see Annex B).
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 4 | European foreword |
| 6 | Foreword |
| 7 | Introduction |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions |
| 10 | 4 Proficiency testing scheme requirement 4.1 PTS provider 4.2 PT homogeneity and stability of proficiency test items 4.2.1 Property homogeneity 4.2.2 PT data and statistics requirement |
| 11 | 5 Comparison of PT precision achieved to published precision 5.1 General 5.2 Perform F-test on the variance ratio 5.2.1 Construction of the variance ratio to be used for the F-test |
| 12 | 5.2.2 Comparison of variance ratio to be tested to a critical value F_crit_,025 |
| 17 | 5.2.3 Multiple comparisons overtime |
| 18 | Annex A (informative) Worked examples of F-test |
| 19 | Annex B (informative) Use of z-scores to monitor an individual participant’s PT performance |
| 22 | Bibliography |
