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BS EN ISO 4259-4:2021:2023 Edition

BS EN ISO 4259-4:2021:2023 Edition

$189.07

Petroleum and related products. Precision of measurement methods and results – Use of statistical control charts to validate ‘in-statistical-control’ status for the execution of a standard test method in a single laboratory

Published By Publication Date Number of Pages
BSI 2023 46
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This document specifies the process and methodology for the construction, operation, and maintenance of statistical control charts to assess if a laboratory’s execution of a standard test method is in-statistical-control and how to establish and validate the ‘in-statistical-control’ status. It specifies control charts that are most appropriate for ISO/TC 28 test methods where the dominant common cause variation is associated with the long term, multiple operator conditions. The control charts specified for determination of in-statistical-control are: individual (I), moving range of 2 (MR2), and either the exponentially weighted moving average (EWMA) or zone-based run rules [similar to Western Electric (WE) run rules[3]] as sensitivity enhancement strategy to support the I-chart. The procedures in this document have been primarily designed for numerical results obtained from testing of control samples prepared from a homogenous source of petroleum and related products in a manner that preserves the homogeneity of properties of interest between control samples. If the test method permits, a certified reference material (CRM) sample is used as a control sample provided the sample composition is representative of the material being tested and is not a pure compound; if this is done then the laboratory best establishes its own mean for the CRM sample. This document is applicable to properties of interest that are (known to be) stable over time, and for data sets with sufficient resolution to support validation of the assumption that the data distribution can be approximately represented by the normal (Gaussian) model. Mitigating strategies are suggested for situations where the assumption cannot be validated.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviated terms
10 3.1 Specific terms and definitions
3.2 Symbols and abbreviated terms
11 4 Statistical control in the execution of a standard test method by a laboratory
4.1 General
12 4.2 Control chart description
4.2.1 General
4.2.2 I- and MR-charts
4.2.3 I-chart sensitivity enhancement strategy
13 4.2.4 In-statistical-control conditions
4.3 Control chart work process
4.3.1 General
4.3.2 Stage 1 of control chart work process
17 4.3.3 Stage 2 of control chart work process
19 4.4 QC material batch change transition
4.4.1 General
20 4.4.2 Procedure 1, concurrent testing
4.4.3 Procedure 2, Q-chart
4.4.4 Procedure 3, dynamically updated I-chart with EWMA
21 5 Guidance for insufficient variation or non-normal data
5.1 General requirement
5.2 How to deal with insufficient variation or non-normal data
5.2.1 Insufficient variation
22 5.2.2 Non-normal data
23 Annex A (informative) Details of the control chart work process
42 Annex B (normative) Check procedures
44 Bibliography

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BS EN ISO 4259-4:2021
$189.07