Improving the performance of CUSUM charts

Improving the performance of CUSUM charts

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Article ID: iaor201112618
Volume: 27
Issue: 4
Start Page Number: 415
End Page Number: 424
Publication Date: Jun 2011
Journal: Quality and Reliability Engineering International
Authors: , ,
Keywords: cusum charts
Abstract:

The control chart is an important statistical technique that is used to monitor the quality of a process. Shewhart control charts are used to detect larger disturbances in the process parameters, whereas CUSUM and EWMA charts are meant for smaller and moderate changes. Runs rules schemes are generally used to enhance the performance of Shewhart control charts. In this study, we propose two runs rules schemes for the CUSUM charts. The performance of these two schemes is compared with the usual CUSUM, the weighted CUSUM, the fast initial response CUSUM and the usual EWMA schemes. The comparisons revealed that the proposed schemes perform better for small and moderate shifts, whereas they reasonably maintain their efficiency for large shifts as well. 2

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