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Robust skewness dispersion control charts

Muhammad Rizwan Iqbal (Department of Statistics and Data Warehouse, State Bank of Pakistan, Karachi, Pakistan)
Sajdah Hassan (Department of Basic Sciences, DHA Suffa University, Karachi, Pakistan)

International Journal of Quality & Reliability Management

ISSN: 0265-671X

Article publication date: 29 November 2018

159

Abstract

Purpose

The purpose of this paper is to explore the scope of robust dispersion control charts in a distribution-free environment, which is a specific case of non-normal control charts. These control charts are skewness-based structures designed to monitor skewed-type processes whilst equally performing under symmetric processes. Moreover, the choice of a suitable control chart for a particular non-normal situation is also suggested.

Design/methodology/approach

The probability control limits approach is considered as an alternative way to determine the skewness-based structure of dispersion control charts. The proposals of five robust and two conventional Shewhart-type dispersion control charts are suggested as efficient competitors of skewness correction (SC) dispersion control charts. The evaluation of robust proposals and competing dispersion control charts is done through false alarm rate (FAR) and probability to signal (PTS) measures.

Findings

The proposed dispersion control charts are found robust and efficient alternatives of SC dispersion control charts in both normal and non-normal distributions. The FARs and PTS properties of proposed control charts are impressive in all studied cases, and a real-data example also verifies the dominance of proposed control charts.

Originality/value

Conventional dispersion control charts quickly lose their efficiency as underlying process distribution deviates from normality; however, robust control charts emerge as most suitable candidates in such situations. This paper proposes the idea of robust dispersion control charts under a distribution-free structure for the skewed-type process, which is not yet explored.

Keywords

Acknowledgements

The authors are thankful to the Editor and referees for their valuable comments and suggestions, which lead to considerable value addition of this paper. The views expressed in this research are those of the author, Muhammad Rizwan Iqbal, and do not represent the views of the State Bank of Pakistan in any way.

Citation

Rizwan Iqbal, M. and Hassan, S. (2018), "Robust skewness dispersion control charts", International Journal of Quality & Reliability Management, Vol. 35 No. 10, pp. 2136-2156. https://doi.org/10.1108/IJQRM-04-2017-0063

Publisher

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Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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