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Title: Design and analysis of simultaneous control charting schemes
Keywords: Average run length; Multiple charting procedures; Optimal design procedure; Shewhart chart; Statistical process control
Issue Date: 13-Feb-2008
Citation: RUSHAN A B ABEYGUNAWARDANA (2008-02-13). Design and analysis of simultaneous control charting schemes. ScholarBank@NUS Repository.
Abstract: Most of the optimal design procedures for the cumulative sum (CUSUM) and exponentially weighted moving average (EWMA) charts require a shift to be specified for which the chart is optimal in detecting. Such a chart would perform well at the intended shift but it will be increasingly insensitive if the shift moves further away from the intended shift. The specification of a shift may not be practical because in reality, the shift that occurs is more likely to be random. Thus it does not make good sense to design a chart this way. We propose simultaneous schemes which do not require any specification of a shift in advance. These simultaneous schemes comprise a few CUSUM or EWMA charts including a Shewhart chart that run simultaneously. We conduct a comprehensive study of the simultaneous schemes and develop a simple design procedure for determining the chart parameters. Such a scheme is found to be sensitive in detecting a range of shifts and has better overall run length performances as compared to individual charts and other simultaneous schemes.
Appears in Collections:Master's Theses (Open)

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