ISO 2859-4:2020 en

Bemonsteringsprocedures voor de keuring op attributen - Deel 4: Procedures voor beoordeling van vastgestelde kwaliteitsniveaus

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Over deze norm

Status Definitief
Aantal pagina's 18
Commissie Toepassing van statistische methoden
Gepubliceerd op 01-06-2020
Taal Engels
ISO 2859-4 establishes single sampling plans for conformance testing, i.e., for assessing whether the quality level of a relevant audit population (lot, process, inventory, file etc) conforms to a declared value. Sampling plans are provided corresponding to four levels of discriminatory ability. The limiting quality ratio (LQR) (see Clause 4) of each sampling plan is given for reference. For levels I-III, the sampling plans have been devised so as to obtain a risk no more than 5 % of contradicting a correct declared quality level. The risk of failing to contradict an incorrectly declared quality level which is related to the LQR is no more than 10 %. The sample sizes for level 0 are designed in a way that the LQR factors of the sampling plans are compatible with the LQR factors for level I.In contrast to the procedures in the other parts of the ISO 2859 series, the procedures in this document are not applicable to acceptance assessment of lots. Generally, this document mainly focuses on controlling type I error, which differs from the balancing of the risks in the procedures for acceptance sampling.This document can be used for various forms of quality inspection in situations where objective evidence of conformity to some declared quality level is to be provided by means of inspection of a sample. The procedures are applicable to entities such as lots, process output, etc. that allow random samples of individual items to be taken from the entity.The sampling plans provided in this document are applicable, but not limited, to the inspection of a variety of targets such as:- end items;- components and raw materials;- operations;- materials in process;- supplies in storage;- maintenance operations;- data or records;- administrative procedures;- accounting procedures or accounting entries;- internal control procedures.This document considers two types of quality models for discrete items and populations, as follows.i) The conforming-nonconforming model, where each item is classified as conforming or nonconforming, and where the quality indicator of a population of items is the proportion p of nonconforming items, or, equivalently, the percentage 100 p of nonconforming items.


ICS-code 03.120.30
Nederlandse titel Bemonsteringsprocedures voor de keuring op attributen - Deel 4: Procedures voor beoordeling van vastgestelde kwaliteitsniveaus
Engelse titel Sampling procedures for inspection by attributes - Part 4: Procedures for assessment of declared quality levels



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