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A Simultaneous Control Chart

Summary: (This paper was presented at the Journal of Quality Technology Session at the 30th Annual Fall Technical Conference of the Chemical and Process Industries Division of the American Society for Quality Control and the Section on Physical and Engineering Sciences of the American Statistical Association in Charlotte, North Carolina, October 23-24, 1986.)A new process control chart, designated the simultaneous control chart, is introduced. Through the use of resistant measures and a modified box plot display, this single chart controls the process level and variability and also supplies information about the process distribution and specifications. It is argued that the simultaneous control chart provides more effective information for decision making than x-bar and R charts since it is (1) more robust against distributional assumption violations and (2) more transparent to the nonstatistical user.

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  • Topics: Statistical Process Control (SPC), Quality Control
  • Keywords: Control charts,Box plots,Process control,Quality control methodology,Resistance
  • Author: White, Edna M.; Schroeder, Roger
  • Journal: Journal of Quality Technology