1.1 本规程涵盖了检查顺序控制轮胎数据因试验条件变化而产生的任何变化所需的程序。这种变化可能会影响候选轮胎的绝对性能和比较性能，因为它们是在任何短或长时间内进行测试的。本实践中涉及的变化是系统或偏差变化，而不是随机变化。看见 附录X1 了解更多详细信息。 1.1.1 可能发生两种类型的变化:时间或测试序列“趋势变化”，线性或曲线变化，以及不太常见的瞬态或突变变化。如果任何观察到的变化被宣布具有统计显著性，则给出计算程序以纠正这些变化的影响。 方法A中介绍了这种方法。 1.2 在一些测试程序中，采用了一种策略来校正所有候选牵引测试数据值，而无需应用统计例程来确定是否观察到显著的趋势或变化。该选项是本实践的一部分，并在方法B中解决。 1.3 拒绝在短时间内相同测试条件下获得的一组其他可接受数据值中可能出现的异常数据点或测试值的问题不属于本实践的一部分。在应用本规程及其程序之前，可以在单个数据集上使用解决此问题的特定测试方法或其他异常值拒绝标准。 1.4 尽管本规程适用于各种类型的轮胎牵引力测试（例如，干、湿、雪、冰），但本规程中给出的程序可用于测试条件可能发生变化的环境中的任何重复轮胎测试。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。

1.1 This practice covers the required procedures for examining sequential control tire data for any variation due to changing test conditions. Such variations may influence absolute and also comparative performance of candidate tires, as they are tested over any short or extended time period. The variations addressed in this practice are systematic or bias variations and not random variations. See Appendix X1 for additional details. 1.1.1 Two types of variation may occur: time or test sequence “trend variations,” either linear or curvilinear, and the less common transient or abrupt shift variations. If any observed variations are declared to be statistically significant, the calculation procedures are given to correct for the influence of these variations. This approach is addressed in Method A. 1.2 In some testing programs, a policy is adopted to correct all candidate traction test data values without the application of a statistical routine to determine if a significant trend or shift is observed. This option is part of this practice and is addressed in Method B. 1.3 The issue of rejecting outlier data points or test values that might occur among a set of otherwise acceptable data values obtained under identical test conditions in a short time period is not part of this practice. Specific test method or other outlier rejection standards that address this issue may be used on the individual data sets prior to applying this practice and its procedures. 1.4 Although this practice applies to various types of tire traction testing (for example, dry, wet, snow, ice), the procedures as given in this practice may be used for any repetitive tire testing in an environment where test conditions are subject to change. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.