AN INVESTIGATION OF THE EFFECTS OF INSPECTION ERRORS ON THE RUN-LENGTH CONTROL CHARTS

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)315-335
Journal / PublicationCommunications in Statistics - Simulation and Computation
Volume29
Issue number1
Publication statusPublished - Feb 2000
Externally publishedYes

Abstract

For continuous inspection schemes in an automated manufacturing environment, a useful alternative to the traditional p or np chart is the Run-Length control chart, which is based on plotting the run lengths (the number of conforming items) between successive nonconforming items. However, its establishment relies on the error-free inspection assumption, which can seldom be met in practice. In this paper, the effects of inspection errors on the Run-Length chart are investigated based on that these errors are assumed known. The actual false alarm probability and the average number inspected (ANI) in the presence of inspection errors are studied. This paper also presents the adjusted control limits for the Run-Length chart, which can provide much closer ANI curves to the ones obtained under error-free inspection.

Research Area(s)

  • Average run length, False alarm probability, Inspection error, Sensitivity analysis, Statistical process control