1.1 本规程描述了当少于六个实验室可用于满足规程建议的最低要求时，用于评估试验方法精度的实验室间研究（ILS）的规划、实施、分析和处理结果的技术 E691型 从实验室间研究获得的数据有助于确定需要修改的变量，以提高试验方法的性能和精度。 1.2 使用本规程编制的精度估算在统计上不等同于规程编制的精确度估算 E691型 因为使用了少量实验室。参与实验室的数量越少，这种做法报告的精度估计值就会严重降低。然而，在只有有限数量的实验室可参与ILS的情况下，本实践制定的精度估计将为用户提供有关测试方法精度的有用信息。 1.3 使用本规程进行ILS至少需要三个合格的实验室。 如果有六个或多个实验室可参与给定测试方法的ILS E691型 应用于进行ILS。 1.4 由于本规程的主要目的是开发精度声明所需的信息，因此本规程中的实验设计对于评估所有材料、测试方法或作为单独实验室分析的工具而言都不是最佳的。 1.5 由于参与实验室数量减少，ILS中应使用实验室监视器。 请参阅指南 第2335页 . 1.6 应用领域- 本规程涉及产生数值或与试验方法相关的不同财产的一系列数值的试验方法。上述数值通常是一组测量值的计算结果。 1.7 本规程包括适用于开发实验室间研究的设计信息，用于具有分类（去-不去）分配测试结果的测试方法。然而，它没有为评估围棋提供推荐的统计实践- 禁止数据。 1.8 这一做法不能用于提供量化措施。 1.9 本规程在E05委员会下发布，但其统计方法具有通用性，因此适用于任何其他方法。 1.10 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.11 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 ASTM规定要求所有试验方法在重复性和再现性方面的精度声明。当精密研究中参与试验的实验室或材料的数量，或两者都少于规程规定的数量时，使用本规程 E691型 。如有可能，强烈建议 E691型 应遵循标准方案来确定测试方法的精度。本标准中所述程序产生的精度结果与完整实践产生的结果不具有相同的精度 E691型 协议该程序将允许在实验室间测试没有完整的实验室时开发有用的精度结果。 5.2 本实践基于实践中提出的实验室间研究和数据分析建议 E691型 本规程不涉及试验方法的开发，而是涉及收集信息和处理数据所需的标准方法，以便在完整规程中制定试验方法的精度声明 E691型 实验室间研究和数据分析是不可能的。

1.1 This practice describes the techniques for planning, conducting, analyzing, and treating results of an interlaboratory study (ILS) for estimating the precision of a test method when fewer than six laboratories are available to meet the recommended minimum requirements of Practice E691 . Data obtained from an interlaboratory study are useful in identifying variables that require modifications for improving test method performance and precision. 1.2 Precision estimates developed using this practice will not be statistically equivalent to precision estimates produced by Practice E691 because a small number of laboratories are used. The smaller number of participating laboratories will seriously reduce the value of precision estimates reported by this practice. However, under circumstances where only a limited number of laboratories are available to participate in an ILS, precision estimates developed by this practice will provide the user with useful information concerning precision for a test method. 1.3 A minimum of three qualified laboratories is required for conducting an ILS using this practice. If six or more laboratories are available to participate in an ILS for a given test method, Practice E691 shall be used for conducting the ILS. 1.4 Since the primary purpose of this practice is the development of the information needed for a precision statement, the experimental design in this practice will not be optimum for evaluating all materials, test methods, or as a tool for individual laboratory analysis. 1.5 Because of the reduced number of participating laboratories, a Laboratory Monitor shall be used in the ILS. See Guide E2335 . 1.6 Field of Application— This practice is concerned with test methods that yield numerical values or a series of numerical values for different properties associated with the test method. The numerical values mentioned above are typically the result of calculations from a set of measurements. 1.7 This practice includes design information suitable for use with the development of interlaboratory studies for test methods that have categorization (go-no-go) allocation test results. However, it does not provide a recommended statistical practice for evaluating the go-no-go data. 1.8 This practice cannot be used to provide quantitative measures. 1.9 This practice is issued under Committee E05, but it is generic in its statistical approach such that it is applicable to any other method. 1.10 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. 1.11 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 ====== 5.1 ASTM regulations require precision statements in all test methods in terms of repeatability and reproducibility. This practice is used when the number of participating laboratories or materials being tested, or both, in a precision study is less than the number specified by Practice E691 . When possible, it is strongly recommended that a full Practice E691 standard protocol be followed to determine test method precision. Precision results produced by the procedures presented in this standard will not have the same degree of accuracy as results generated by a full Practice E691 protocol. This procedure will allow for the development of useful precision results when a full complement of laboratories is not available for interlaboratory testing. 5.2 This practice is based on recommendations for interlaboratory studies and data analysis presented in Practice E691 . This practice does not concern itself with the development of test methods but with a standard means for gathering information and treating the data needed for developing a precision statement for a test method when a complete Practice E691 interlaboratory study and data analysis are not possible.