Non-parametric Control Chart for Controlling Variability Based on Rank Test

Das Nandini
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Das Nandini: SQC-OR Unit Indian Statistical Institute, 203 B T Road, Kolkata-700108, India. nandini@isical.ac.in

Stochastics and Quality Control, 2008, vol. 23, issue 2, 227-242

Abstract: Control charts are used to identify the presence of an assignable cause of variation in the process. The non-parametric control chart is an emerging area of development in the theory of SPC. Its main advantage is that it does not require any knowledge about the underlying distribution of the variable. In this paper two non-parametric control charts for controlling variability are derived based on two non-parametric tests. Their in-control state performance is analyzed for different distributions by means of simulations. Furthermore, their efficiency in detecting shifts in the variability is evaluated.

Date: 2008
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DOI: 10.1515/EQC.2008.227

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