On the Performance of Phase I Dispersion Control Charts for Process Monitoring

Saddam Akber Abbasi · Muhammad Riaz · Arden Miller · Shabbir Ahmad

24 citations0/0 files storedQuality and Reliability Engineering International

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Advanced Statistical Process Monitoring Fault Detection and Control Systems Management Systems and Quality Improvement

Abstract

Control charts are usually implemented in two phases: the retrospective phase (phase I) and the monitoring phase (phase II). The performance of any phase II control chart structure depends on the preciseness of the control limits obtained from the phase I analysis. In statistical process control, the performance of phase I dispersion charts has mainly been investigated for normal or contaminated normal distributions of the quality characteristic of interest. Little work has been carried out to investigate the performance of a wide range of possible phase I dispersion charts for processes following non‐normal distributions. The current study deals with the proper choice of a control chart for the evaluation of process dispersion in phase I. We have analyzed the performance of a wide range of dispersion control charts, including two distribution‐free structures. The performance of the control charts is evaluated in terms of probability to signal, under normal and non‐normal process setups. These results will be useful for quality control practitioners in their selection of a phase I control chart. Copyright © 2014 John Wiley & Sons, Ltd.

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References

2006Effects of Parameter Estimation on Control Chart Properties: A Literature Review 2000Controversies and Contradictions in Statistical Process Control 1987Introduction to Statistical Quality Control 2008Phase I Statistical Process Control Charts: An Overview and Some Results 1989Robust Control Charts 2011A Distribution‐free Control Chart for the Joint Monitoring of Location and Scale 2011On Proper Choice of Variability Control Chart for Normal and Non‐normal Processes 2008A Simple Robust Control Chart Based on MAD

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