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Computer Programs: Economic Design of an X-Bar Control Chart

Summary: A computer program for the optimal economic design of an X-bar control chart is presented. A single assignable cause system is assumed, where the mean time between process shifts is an exponentially distributed random variable. Given fixed and variable sampling costs, the costs of investigating action signals, the penalty cost of production in the out-of-control state, and other parameters describing process performance, the program finds the sample size, control limit width and interval between samples that minimize the expected total costs per unit time.

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  • Topics: Statistical Process Control (SPC)
  • Keywords: Computer programs,Economics,Process control,X-bar control charts
  • Author: Montgomery, Douglas C.; Nelson, Peter R. (edited by)
  • Journal: Journal of Quality Technology