标准号：ISO 28801-2011
实施状态：作废
中文名称：厂方风险质量(PRQ)和消费者风险质量(CRQ)索引,用最少样本量属性的二重抽样计划
英文名称：Double sampling plans by attributes with minimal sample sizes, indexed by producer's risk quality (PRQ) and consumer's risk quality (CRQ)
发布日期：2011-03-15
实施日期：2011-03-15
被替代标准：ISO 28592-2017
代替标准：ISO/FDIS 28801-2010
采用标准：BS ISO 28801-2011,IDT;SANS 28801-2014,IDT;GOST R ISO 28801-2013,IDT;DS/ISO 28801-2011,IDT;UNI ISO 28801-2014-2014,IDT;SANS 28801-2014,IDT;SANS 28801-2014-2014,IDT;CSN ISO 28801-2013,IDT;DS/ISO 28801-2011,IDT;NEN-ISO 28801-2011 en-2011,IDT;SANS 28801-2014-2014,IDT
起草单位：ISO/TC 69
标准简介：This International Standard 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.
文件格式：PDF
文件大小：2.30MB
文件页数：78
（以上信息更新时间为：2019-11-22）
ISO 28801-2011 厂方风险质量(PRQ)和消费者风险质量(CRQ)索引,用最少样本量属性的二重抽样计划.pdf
(2.3 MB)
|
|
