Monitoring of Linear Profiles Using Change-Point Detection Method

A control chart based on the sequential change-point detection model is proposed for monitoring the linear profiles. This chart based on generalized likelihood ratio statistics can detect a shift in either the intercept or the slope or the standard deviation by a single chart that is different from the other control charts for linear profiles. The simulated results show that our approach has good performance across the range of possible shifts. The simple diagnostic aids are also given to estimate the location of the change and determine which of the parameters has changed. We also investigate the effectiveness of these aids and give comparisons with the traditional methods.