Study on State Transition Tracking Method in Process Fraction Nonconforming

Yasuhiko Takemoto1, Ikuo Arizono2

  • 1Kindai University
  • 2Okayama University

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Category

Regular Session

Sessions

11:00 - 12:28 | Wed 28 Aug | 016 | WeAT7

Lean Manufacturing and Quality Management - I

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Abstract

When a control chart signals that an assignable cause is present, process engineers are required to identify a time point of process changes and then search for the assignable cause of the process disturbance. In the statistical process control literature, there is a research area called change point detection. As one of change point detection problems, it has been considered how to identify the time of a step change in the process fraction nonconforming using the maximum likelihood theory. However, the process fraction nonconforming may be changed multiple times until a chart signals. Such a multiple change-points model for the process fraction nonconforming has not been considered yet. In this study, we consider a multiple change-points model of the process fraction nonconforming under a p chart. Then, a method of tracking the transition of process fraction nonconforming is proposed using the maximum likelihood theory and information criterion.

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