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ČSN EN ISO 4259-4 (656003)
Petroleum and related products - Precision of measurement methods and results - Part 4: Use of statistical control charts to validate ´in-statistical-control´ status for the execution of a standard test method in a single laboratory
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STANDARD published on 1.12.2022
The information about the standard:
Designation standards: ČSN EN ISO 4259-4
Classification mark: 656003
Catalog number: 515627
Publication date standards: 1.12.2022
SKU: NS-1091113
The number of pages: 52
Approximate weight : 156 g (0.34 lbs)
Country: Czech technical standard
Category: Technical standards ČSN
The category - similar standards:
Annotation of standard text ČSN EN ISO 4259-4 (656003):
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] 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
Preview of the standard ČSN EN ISO 4259-4 (656003)
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