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Time-Series Modeling for Statistical Process Control
Layth C. Alwan and Harry V. Roberts
Journal of Business & Economic Statistics
Vol. 6, No. 1 (Jan., 1988), pp. 87-95
Stable URL: http://www.jstor.org/stable/1391421
Page Count: 9
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In statistical process control, a state of statistical control is identified with a process generating independent and identically distributed random variables. It is often difficult in practice to attain a state of statistical control in this strict sense; autocorrelations and other systematic time-series effects are often substantial. In the face of these effects, standard control-chart procedures can be seriously misleading. We propose and illustrate statistical modeling and fitting of time-series effects and the application of standard control-chart procedures to the residuals from these fits. The fitted values can be plotted separately to show estimates of the systematic effects.
Journal of Business & Economic Statistics © 1988 American Statistical Association