Recent years have seen mounting interest in measuring process performance in the manufacturing industry. Analysis of process capability indices allows a production department to trace and improve a poor process to enhance quality and satisfy customers. Process capability analysis can also serve...

Many process capability indices have been proposed to measure process performance. In this paper, we first review C p , C pk , C pm and C pmk , and their generalizations, C Np , C Npk , C Npm and C Npmk , and then propose a new index S pmk for any underlying distribution, which takes into...

When the process probability distribution is non‐normal or is unknown, the process mean and standard deviation may not properly describe the distribution’s shape. Consequently, the traditional process capability indices (PCI) C p , C pk , C pm and C pmk cannot express the actual process...