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Two Sets of Runs Rules for the X Chart

Summary: [This abstract is based on the author’s abstract.]Control charts are used with run rules to increase their ability to detect small shifts. The performances of two sets of run rules are reviewed. Run rules based on these sets are proposed that are intended to be used with a modified Shewhart X-bar chart. These proposed charts performed better than the Shewhart X-bar chart for detecting small shifts, and were comparable in performance for large shifts.

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  • Topics: Statistical Process Control (SPC)
  • Keywords: Average run length (ARL), Control limits, Markov chains, Run rules, Warning limits
  • Author: Acosta-Mejia, C. A.
  • Journal: Quality Engineering