PROCESS CAPABILITY INDEX-BASED CONTROL CHART FOR VARIABLES

Olatunde Adebayo Adeoti, John Olutunji Olaomi

Abstract


This paper proposes a process capability index-based control chart for variables using the Downton estimator with a specified Cp value. The proposed chart is able to address the issue of control and capability simultaneously. We also provide a control chart constant to construct the process capability index-based control chart. A numerical example is presented to demonstrate the application of the proposed chart, and the effect of non-normality is discussed. The result shows that the proposed control chart performs better in monitoring and assessing processes, and eliminates the usual two-stage procedure reflected in the literature.


Keywords


Downton's statistics; Process capability index; Control chart

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DOI: http://dx.doi.org/10.7166/28-2-1353

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Copyright (c) 2017 Olatunde Adebayo Adeoti, John Olutunji Olaomi


ISSN 2224-7890 (on-line) ; ISSN 1012-277X (print)


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