A process capability index for zero-inflated processes

The proportion of zero defect (ZD) outputs is as an integral characteristic a zero-inflated (ZI) process or high quality process. Different ZI processes can almost equally satisfy the same USL number defects but they produce substantially different proportions ZD products. application conventional method for capability evaluation fails to discriminate these because in method, evaluated taking into consideration only. In this paper, new measure proposed that truly account well units produced processes. approach, at first index (PCI) with respect computed, and then overall PCI obtained by multiplying it appropriately defined factor. A real-life presented.