本文件涵盖了评估两种试验方法（旨在测量材料的相同特性）之间预期一致性的统计方法，并确定简单的线性偏差修正是否可以进一步改善预期一致性。 本方法适用于测量石油或石油产品定量（数值）特性的试验方法。 它旨在与从满足ISO 4259要求的实验室间研究中收集的结果一起使用- 1或同等标准（如ASTM D6300）。实验室间研究必须至少对十种跨越试验方法交叉范围的材料进行，并且必须使用每种方法从至少十个实验室获得结果。 本实施规程中概述的统计方法也适用于评估旨在测量材料相同性能的任何两种试验方法之间的预期一致性，前提是在相同的比较样本集上获得结果，与每个试验结果相关的标准误差已知，且样本集设计满足本实施规程的要求，特别是，与所有标准误差相关联的统计自由度为30或更大。

This document specifies statistical methodology for assessing the expected agreement between two test methods that purport to measure the same property of a material, and for deciding if a simple linear bias correction can further improve the expected agreement. This document is applicable for analytical methods which measure quantitative properties of petroleum or petroleum products resulting from a multi-sample-multi-lab study (MSMLS). These types of studies include but are not limited to interlaboratory studies (ILS) meeting the requirements of ISO 4259-1 or equivalent, and proficiency testing programmes (PTP) meeting the requirements of ISO 4259-3 or equivalent. The methodology specified in this document establishes the limiting value for the difference between two results where each result is obtained by a different operator using different apparatus and two methods X and Y, respectively, on identical material. One of the methods (X or Y) has been appropriately bias-corrected to agree with the other in accordance with this practice. This limit is designated as the between-methods reproducibility. This value is expected to be exceeded with a probability of 5 % under the correct and normal operation of both test methods due to random variation. NOTE      Further conditions for application of this methodology are given in 5.1 and 5.2.