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...

For non‐normal Pearsonian processes, Clements proposed a method for calculating estimators of the two basic process capability indices C p and C pk . Pearn and Kotz applied Clements’ method to obtain estimators for the other two more advanced process capability indices C pm and C pmk . Their...