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Title
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استنباط نقطه تغيير در كنترل كيفيت
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Type
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Thesis
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Keywords
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Quality control , change point estimation , control chart , maximum likelihood estimator , special cause identification , process improvementQuality control , change point estimation , control chart , maximum likelihood estimator , special cause identification , process improvement
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Abstract
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In this thesis, we discuss the problem of change point estimation in quality control. When the control chart makes a signal which shows that the process is out of control, and the process mean has been changed if we can find a good estimate of the change point, the main cause of disturbances can be identified more quickly. Last studies usually assume that the change in the process mean is a step change, and under this assumption, using Bayesian and Classical methods,
the change point is estimated. In this thesis it is assumed that the change. In the process mean has a linear trend. Under this condition the change point is estimated. In addition, a new criteria for evaluating the estimate of the change point is introduced. Then, using this criteria, the efficiency of the estimators is evaluated in different conditions.
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Researchers
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Mohammad Esmail Dehghan Monfared (Primary advisor) , Fazlollah Lak (Advisor)
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