Identifying the time of step change in binary profiles |
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Authors: | Alireza Sharafi Majid Aminnayeri Amirhossein Amiri |
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Affiliation: | 1. Department of Industrial Engineering, Amirkabir University of Technology, Tehran, Iran 2. Department of Industrial Engineering, Faculty of Engineering, Shahed University, Tehran, Iran
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Abstract: | Control charts are intended to aid quality practitioners in monitoring whether a change has occurred in a process. When a control chart indicates an out-of-control signal, it means that the process has changed. However, control chart signals do not indicate the real time of process changes; so estimators are applied to indicate the time when a change in the process takes place, which is referred to as the change point. This paper provides a maximum likelihood estimator to identify the real time of a step change in phase II monitoring of binary profiles, in which the quality of a process is characterized by a logistic regression between the response and predictor variables. Simulation studies are provided to evaluate the effectiveness of the change point estimator. |
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