On constructing T2 control charts for on-line process monitoring

    loading  Checking for direct PDF access through Ovid

Abstract

In this paper we study the performance of χ2 control limits on T2 control charts during on-line process monitoring. We make recommendations on the minimum number of subgroups necessary for control charts based on estimated parameters to perform similar to control charts based on true parameters when the χ2 control limit is used. We discuss an exact procedure for constructing T2 control charts using estimated parameters that perform similar to control charts based on true parameters regardless of the number of preliminary subgroups. Furthermore, we suggest an implementation approach for using Alt's control limit on T2 control charts until the accumulation of recommended minimum number of subgroups.

Related Topics

    loading  Loading Related Articles