ENBIS-17 in Naples

9 – 14 September 2017; Naples (Italy) Abstract submission: 21 November 2016 – 10 May 2017

Issues in the Revision of ISO 3951-1

13 September 2017, 09:20 – 09:40

Abstract

Submitted by
Rainer Göb
Authors
Rainer Göb (University of Würzburg)
Abstract
The ISO (International Organization for Standardization) acceptance sampling standards and their national versions are the most widely used statistical standards. ISO 3951 is a multi-part series of standards for variables sampling where the proportion nonconforming is determined as the probability of a normally distributed measurement falling outside a specification range. ISO 3951-1, a descendent of MIL-STD-414, considers sampling plans for univariate plans, sampling plans for multivariate characteristics are provided by ISO 3952-2. The present versions of the standards exhibit deficiencies which have often been criticised by users, in particular: 1) Intransparent structure, missing separation of operational rules, tables, examples, and informative material. 2) The use of nomograms for executing sampling plans under unknown standard deviation of the quality characteristic (so-called "sigma method"). 3) Missing support of quality parameter estimation. The present contribution analyses the deficiencies of 3951-1 and outlines a plan for a suitable revision of the standard. In particular, a method for avoiding the use of nomograms in the operation of the sigma method will be presented. The revision plan is currently being discussed be the responsible technical committee TC 69 ``Application of statistical methods'' at ISO.

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