Process Capability Index for Logistic Regression Profile Based on Spmk Index

Profile is a relationship between a response variable and one or more independent variables which can describe quality of a process or a product. On the other hand, for an in-control process, capability indices are criteria for the process quality improvement that allows to meet customers’ expectations. Despite a considerable number of applications and monitoring methods already proposed for profiles, a few researches have been focused on the process capability index of profiles. In this paper, we propose a new Spmk index to measure the process capability when the quality of the process is characterized by a logistic regression profile. The performance of the proposed index is evaluated through simulations. Finally, the application of the proposed index is illustrated through a real case.