A Design of <i>s</i> Control Charts with a Combined Double Sampling and Variable Sampling Interval Scheme

Abstract

Abstract This study extended the idea of Carot et al. (Citation2002) to combine double sampling and variable sampling interval s charts (DSVSI s chart) for improving efficiency in detection of small standard deviation shifts. The performance of DSVSI s charts in detecting small shifts was measured and compared with double sampling, variable sampling intervals, EWMA, and Cusum control charts. This comparative study presented found the DSVSI s chart to be efficient in detecting small shifts. Keywords: Double sampling control chartProcess monitoringShewhart s chartVariable sampling interval control chartMathematics Subject Classification: 62P3062E17