Re-evaluation of performance for adaptive charts

Purpose - The purpose of this paper is to re-evaluate the performance of the adaptive control charts which allow some of their design parameters to change during production depending on the collected information from samples over time. Instead of employing a single performance measure (average time to signal process changes), a set of measures, associated with the inspection efficiency and effort, is taken into account in the evaluation process. Design/methodology/approach - A multivariate analysis of variation (MANOVA) approach along with the post hoc analysis are applied to investigate the performance of different adaptive control charts based on different measures. Findings - The findings indicate that different adaptive control charts may have different performance, depending on the measure regarded and the value of shift in process mean. In general, the VSSC, VSSI, and VSI control charts would be recommended for a process with a small, moderate, and large shift, respectively. The SS chart is still the best choice for a process with an extremely large shift. Research limitations/implications - Up to now, the proposed procedure has been developed for the comparative analyses of adaptive X̄ charts, but it could be adjusted for other adaptive charts as well. Originality/value - This paper provides a review of the performance of adaptive control charts from a novel perspective.