IP 367 Part 3: Petroleum and related products - Precision of measurement methods and results - Monitoring and verification of published precision data in relation to methods of test

Overview:

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.