ISO/TR 9272:2005 橡胶与橡胶制品 试验方法标准精度的测定

标准编号：ISO/TR 9272:2005

中文名称：橡胶与橡胶制品 试验方法标准精度的测定

英文名称：Rubber and rubber products — Determination of precision for test method standards

发布日期：2005-07

标准范围

ISO/TR 9272:2005提供了通过实验室间测试程序（ITP）确定橡胶制造和炭黑工业中使用的测试方法标准精度的指南。它使用ISO 5725的基本单向方差分析计算算法和尽可能多的ISO 5725的术语和定义，这些术语和定义与这两个行业的过去历史和精度测定程序不冲突。尽管本技术报告中未确定偏差，但它是理解精密度测定的基本概念。本技术报告中未确定ISO 5725准确性和真实性概念。给出了两种精度确定方法，它们被描述为“稳健”统计程序，试图消除或大大减少异常值的影响。第一个是适用于橡胶制造行业所有测试方法的“1级精度”程序，第二个是通用精度程序的特定变体，称为“2级精度”，适用于炭黑测试。两者都使用相同的均匀水平实验设计和Mandel h和k统计量来检查精度数据库中的潜在异常值。然而，他们在程序中使用轻微的修改来拒绝不兼容的数据值作为异常值。“2级精密度”程序具体规定了每个数据库单元或材料—实验室组合的重复次数。

ISO/TR 9272:2005 presents guidelines for determining, by means of interlaboratory test programmes (ITPs), precision for test method standards used in the rubber manufacturing and the carbon black industries. It uses the basic one-way analysis of variance calculation algorithms of ISO 5725 and as many of the terms and definitions of ISO 5725 as possible that do not conflict with the past history and procedures for precision determination in these two industries. Although bias is not determined in this Technical Report, it is an essential concept in understanding precision determination. The ISO 5725 concepts of accuracy and trueness are not determined in this Technical Report.Two precision determination methods are given that are described as 'robust' statistical procedures that attempt to eliminate or substantially decrease the influence of outliers. The first is a 'level 1 precision' procedure intended for all test methods in the rubber manufacturing industry and the second is a specific variation of the general precision procedure, designated 'level 2 precision', that applies to carbon black testing. Both of these use the same uniform level experimental design and the Mandel h and k statistics to review the precision database for potential outliers. However, they use slight modifications in the procedure for rejecting incompatible data values as outliers. The 'level 2 precision' procedure is specific as to the number of replicates per database cell or material-laboratory combination.

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