A new control chart for monitoring the event frequency and magnitude Online publication date: Thu, 29-Jan-2015
by L. Qu; Z. Wu; M.B.C. Khoo; L.J. Shu
European J. of Industrial Engineering (EJIE), Vol. 8, No. 6, 2014
Abstract: This article presents a single statistical process control chart, the G chart, for monitoring a critical event through the simultaneously testing of the time interval T and magnitude X of the event. The G chart is not only able to make decisions based on both T and X, but is also capable to optimally allocate the detection power between that against T shifts and X shifts, and between that against small shifts and large shifts. Moreover, the G chart retains most of the advantages of the Shewhart type charts of easy design, implementation and understanding. The results of performance studies show that the G chart is much more effective than all other Shewhart charts in literature for detecting the out-of-control status of an event. The G chart can be applied to many areas, especially to non-manufacturing sectors such as supply chain management and healthcare industry. [Received 23 August 2011; Revised 11 December 2012; Revised 10 March 2013; Accepted 23 July 2013]
Online publication date: Thu, 29-Jan-2015
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