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Contributors to a multivariate statistical process control chart signal
Authors:George C Runger  Frank B Alt  Douglas C Montgomery
Institution:1. College of Business and Management , University of Maryland , College Park, MD, 20742;2. College of Engineering and Applied Sciences , Arizona State University , Temp, AZ, 85287
Abstract:A significant practical disadvantage of multivariate statistical process control is that it is difficult to determine which of the monitored variables is responsible for the out-of-control signal. While there have been several proposed techniques and diagnostics, most of these have disadvantages. Rather than an ad hoc selection, we use three approaches to develop a diagnostic for a chi-square chart and generate the same statistic from each approach. Consequently, intuitive interpretations of the diagnostic are provided and previous proposals are simplified by a focus on a single metric.
Keywords:chi-square chart  T2 chart  X2 chart  assignable cause
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