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This article proposes a CUSUM chart, called the R-CUSUM chart, for the monitoring of a negative event. This chart is developed using a Markov model. It is able to check both the time interval (T) between occurrences of the event and the size (C) of each occurrence. Our studies show that the R-CUSUM chart is more effective than the existing R (=C/T) chart for event monitoring. The improvement in performance...
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