按属性和最小样本量的双重抽样计划 由生产商编制索引'；s风险质量（PRQ）和消费者'；s风险质量（CRQ

[中文适用范围]： 本国际标准提供了按属性对批量离散项目进行验收检验的双重抽样计划。 这些计划按生产者风险质量 (PRQ) 和消费者风险质量 (CRQ) 编制索引，其中名义生产者风险和消费者风险分别为 (5%, 5%)、(5%, 10%) 或 (10%, 10%）。 提供了不合格百分比检查和每 100 项不合格检查的计划。 如果第一个随机样本中没有不合格品（不合格品），则该批次被接受；如果包含两个或多个不合格品（不合格品），则该批次被拒绝。 如果在第一个样本中恰好发现一个不合格项，则随机抽取第二个样本；如果第二个样品不包含不合格品（不合格品），则该批次被接受，否则被拒绝。 本国际标准的目的是提供程序，以便在质量特别好或特别差的情况下能够快速、经济地确定批次处置。 对于中等质量，会抽取第二个样品，以便能够更可靠地区分可接受和不可接受的批次。 选择这两个样本量是为了在不超过标称风险的情况下，最大限度地减少与来料质量相关的最大预期样本量。 类似地，计划可用于测试批次或过程质量水平等于PRQ（即可接受）的假设与质量水平等于CRQ（即不可接受）的替代假设。 在以下情况下，该计划优于单次抽样计划：检验成本较高，可能需要第二个样品而造成的延迟和不确定性无关紧要，并且可以容忍消费者风险质量与生产商风险质量的相对较大比例。 。 该计划适用于孤立批次或短系列批次，其中两个样本大小之和不大于批次大小的 10% 左右。 该计划还适用于连续系列批次，即对不符合验收标准的批次进行 100% 检验，并将所有不合格品替换为合格品；然而，对于连续系列批次，还应考虑使用 ISO 2859-1 中的双重抽样计划。 附录 A 提供了计划、表格和图表所依据的统计理论。 [外文原描述]： ISO 28592:2017 provides double sampling plans by attributes for the acceptance inspection of lots of discrete items. The plans are indexed by the producer's risk quality (PRQ) and the consumer's risk quality (CRQ) where the nominal producer's and consumer's risks are respectively either (5 %, 5 %), (5 %, 10 %) or (10 %, 10 %). Plans are provided for inspection for percent nonconforming and for inspection for nonconformities per 100 items. The lot is accepted if there are no nonconforming items (nonconformities) in the first random sample, and rejected if it contains two or more nonconforming items (nonconformities). If precisely one nonconforming item is found in the first sample, a second random sample is drawn; the lot is then accepted if the second sample contains no nonconforming items (nonconformities) and rejected otherwise. The objective of this International Standard is to provide procedures that enable lot disposition to be determined quickly and economically if quality is particularly good or bad. For intermediate quality, a second sample is drawn in order to be able to discriminate more reliably between acceptable and unacceptable lots. The two sample sizes are chosen to minimize the maximum expected sample size with respect to incoming quality subject to the nominal risks not being exceeded. Similarly, the plans may be used to test the hypothesis that a lot or process quality level is equal to the PRQ (i.e. acceptable) against the alternative hypothesis that the quality level is equal to the CRQ (i.e. unacceptable). The plans are preferable to single sampling plans where the cost of inspection is high, where the delay and uncertainty caused by the possible requirement for second samples is inconsequential and where a relatively large ratio of the consumer's risk quality to the producer's risk quality can be tolerated. The plans are suitable for isolated lots or for short series of lots, where the sum of the two sample sizes is no larger than about 10 % of the size of the lot. The plans are also suitable for continuing series of lots when lots that fail to satisfy the acceptance criteria are 100 % inspected and all nonconforming items replaced by conforming items; however, for continuing series of lots, consideration should also be given to using double sampling plans from ISO 2859‑1. The statistical theory underlying the plans, tables and figures is provided in Annex A.