Approximate Confidence Sets for a Stationary ARp Process

Abstract

A renewal theory approach is proposed to derive the cost model for multiple dependent process steps. The optimal multiple cause-selecting control chart and individual Y control chart are thus constructed to monitor the specific product quality and overall product quality contributed by the multiple dependent process steps. They may be used to maintain the process with minimum cost and effectively distinguish which component of the process steps is out of control. An example is given to illustrate the application of the optimal multiple cause-selecting control chart and individual Y control chart.