1.1 本惯例涵盖了两个缔约方使用的指南和统计方法（见 注1 )可以比较和组合独立获得的测试结果，以获得指定的测试值( 亚视 )为了解决产品性能符合规范的争议。 注1: 这种做法的应用通常（但不限于）在产品的供应商和接收方之间进行。 1.2 本规程定义了确定验收极限的技术( 铝 )和指定的测试值( 亚视 )通过比较 亚视 到 铝 . 1.3 本规程仅适用于那些明确说明重复性和再现性值符合本文定义的试验方法。 1.4 本实践中概述的统计原则和方法也可用于获得 亚视 当在单个实验室内获得同一批次产品的多个结果时，用于规范一致性决策。对于该应用，现场精度（R’）如实践中所定义 D6299 应代替试验方法公布的再现性（R）。 1.5 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。 ====意义和用途====== 4.1 本惯例提供了一种方法，各方可以通过该方法解决可测试和数字表示的产品特性的规范符合性争议。 4.1.1 本规程可用于确保在标签或产品的其他描述中正确说明此类特性。 4.1.2 这种做法可以在以下情况下实施:供应商在将产品交付给发货人（中间接收人）之前，使用内部或商业测试实验室对产品进行采样和测试，最终接收人在产品到达目的地时也使用内部或商业测试实验室对产品进行采样和测试。 这个 亚视 仍将根据 8.3 . 4.2 如果特性的真实值足够接近规范极限，则可以根据双方约定的符合规范决策的概率，应用本实践确定规范极限的公差。此类公差以 验收极限（AL） . 如果 亚视 应用此实践确定的价值取决于 铝 或在可接受的方面 铝 ，可以认为产品性能符合规范；否则应视为不符合规范。 4.3 本实践的应用要求 铝 在实际开始测试之前确定。因此，规范的临界程度由计算 铝 在执行实际产品测试之前，双方应达成一致。 4.3.1 该协议应包括以下决定: 亚视 由绝对法或修约法确定 E29年 ，如其中所定义。 4.3.1.1 如果要使用舍入法，还必须商定要保留的有效位数。 4.3.1.2 在只有一方参与的情况下，也必须做出这些决定，例如在标签的情况下。 4.3.1.3 在没有此类协议的情况下，本惯例建议 亚视 按实际修约方法修约 E29年 适用规范中规定的有效位数。 4.4 本惯例适用于管理石油产品和润滑油从供应商转移到接收方的合同中的参考。 4.5 作为验收本规程中使用的实验室测试结果的先决条件，应满足以下条件: 4.5.1 现场精度（R ′ )根据实践中的定义 D6299 对于每个实验室的适当测试方法，由符合以下要求的控制图证实: D6299 根据内部质量控制计划，对于有争议的产品的典型特性，对于精度比<4的方法，TPI应大于1.2，对于精度比的方法，TPI应大于2.4 ≥ 4（见实践 D6792 用于TPI解释）。 4.5.2 根据指南中概述的方法，每个实验室应能够通过实验室间交换计划的结果证明，相对于适当测试方法的交换平均值，缺乏系统偏差 D7372 . 4.5.3 如果双方实验室的现场精度在统计上存在差异，并通过F-测试确认（见 附件A4 )，然后，为了建立 亚视 每个实验室的测试结果应根据实验室证明的方差进行反向加权。 4.6 建议在合格统计学家的指导下进行这种做法。

1.1 This practice covers guidelines and statistical methodologies with which two parties (see Note 1 ) can compare and combine independently obtained test results to obtain an Assigned Test Value ( ATV ) for the purpose of resolving a dispute over product property conformance with specification. Note 1: Application of this practice is usually, but not limited to, between supplier and receiver of a product. 1.2 This practice defines a technique for establishing an Acceptance Limit ( AL ) and Assigned Test Value ( ATV ) to resolve the dispute over a property conformance with specification by comparing the ATV to the AL . 1.3 This practice applies only to those test methods which specifically state that the repeatability and reproducibility values conform to the definitions herein. 1.4 The statistical principles and methodology outlined in this practice can also be used to obtain an ATV for specification conformance decision when multiple results are obtained for the same batch of product within a single laboratory. For this application, site precision (R') as defined in Practice D6299 shall be used in lieu of test method published reproducibility (R). 1.5 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. ====== Significance And Use ====== 4.1 This practice provides a means whereby the parties can resolve disputes over specification conformance for those product properties which can be tested and expressed numerically. 4.1.1 This practice can be used to ensure that such properties are correctly stated on labels or in other descriptions of the product. 4.1.2 This practice can be implemented in those cases where a supplier uses an in-house or a commercial testing laboratory to sample and test a product prior to releasing the product to a shipper (intermediate receiver) and the ultimate receiver also uses an in-house or commercial testing laboratory to sample and test the product upon arrival at the destination. The ATV would still be determined according to 8.3 . 4.2 This practice can be applied in the determination of tolerances from specification limits based on a mutually agreed probability between parties for making the conformance to specification decision if the true value of a property is sufficiently close to the specification limit. Such tolerances are bounded by an acceptance limit (AL) . If the ATV value determined by applying this practice falls on the AL or on the acceptable side of the AL , the product property can be considered to have met the specification; otherwise it shall be considered to have failed to meet the specification. 4.3 Application of this practice requires the AL be determined prior to actual commencement of testing. Therefore, the degree of criticality of the specification, as determined by the Probability of Acceptance (P value) that is required to calculate the AL , shall have been mutually agreed upon between both parties prior to execution of actual product testing. 4.3.1 This agreement should include a decision as to whether the ATV is to be determined by the absolute or rounding-off method of Practice E29 , as therein defined. 4.3.1.1 If the rounding-off method is to be used, the number of significant digits to be retained must also be agreed upon. 4.3.1.2 These decisions must also be made in the case where only one party is involved, as in the case of a label. 4.3.1.3 In the absence of such an agreement, this practice recommends the ATV be rounded in accordance with the rounding-off method in Practice E29 to the number of significant digits that are specified in the governing specification. 4.4 This practice is designed to be suitable for reference in contracts governing the transfer of petroleum products and lubricants from a supplier to a receiver. 4.5 As a prerequisite for acceptance for lab test results to be used in this practice, the following conditions shall be satisfied: 4.5.1 Site precision (R ′ ) as defined in Practice D6299 for the appropriate test method(s) from each lab, as substantiated by control charts meeting the requirement of D6299 from in-house quality control programs, for property typical of the product in dispute, should have a TPI > 1.2 for methods with Precision Ratio <4 and TPI > 2.4 for methods with Precision Ratio ≥ 4 (see Practice D6792 for TPI explanation). 4.5.2 Each lab shall be able to demonstrate, by way of results from interlaboratory exchange programs, a lack of a systemic bias relative to exchange averages for the appropriate test method(s) as per methodology outlined in Guide D7372 . 4.5.3 In the event that the site precision of laboratories from two parties are statistically different as confirmed by the F-test (see Annex A4 ), then, for the purpose of establishing the ATV , each laboratory's test result shall be inversely weighted in accordance with laboratory's demonstrated variance. 4.6 It is recommended that this practice be conducted under the guidance of a qualified statistician.