Abstract
Geometric profiles can be modeled effectively by large and small scale components. In several articles, a regression model with spatial autoregressive error term is combined with control charts to monitor geometric profiles. However, once a signal occurs, control charts would not be able to determine whether the shift is due to the large or small scale component. In this article, a combination of a multivariate and an omnibus control charts is used to monitor the large scale and small scale components to determine whether the shift is due to the large scale or small scale components.
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