Joint economic design of X̄ and R control charts for processes subject to two independent assignable causes
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Chapman Hall Ltd
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A model for the joint economic design of X̄ and R control charts is developed. This model assumes that the process is subject to two assignable causes. One assignable cause shifts the process mean; the other shifts the process variance. The occurrence of the assignable cause of one kind does not block the occurrence of the assignable cause of another kind. Consequently, a second process parameter can go out-of-control after the first process parameter has gone out-of-control. A numerical study of the cost surface to the model considered has revealed that it is convex, at least in the interest region.
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Costs, Economics, Estimation, Mathematical models, Numerical analysis, Optimization, Statistical methods, Control charts, Economic model, Joint economic design, Process mean, Process variance, Process control
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Inglês
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Iie Transactions. London: Chapman Hall Ltd, v. 25, n. 6, p. 27-33, 1993.
