Linear Profile Monitoring using an Adaptive EWMA Control Chart

A novel adaptive Exponentially Weighted Moving Average scheme, called AEWMA3, is suggested for monitoring the stability of a linear relationship between a quality characteristic and an explanatory variable. Comparisons with an analogous non-adaptive scheme points to a better overall performance of the suggested scheme in a variety of out-of-control scenarios. In addition, since a single AEWMA3 chart is able to quickly detect both small and large shifts, its practical design is simpler than that of other competing control charts.