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Performance of the Control Chart Trend Rule Under Linear Shift

Summary: Approximate average run lengths of Shewhart charts using various trend rules are presented. It is shown that the trend rule is not effective in detecting a linear shift in the mean of the monitored process.

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  • Topics: Statistical Process Control (SPC)
  • Keywords: Shewhart control chart,Average run length (ARL),Statistical process control (SPC)
  • Author: Davis, Robert B.; Woodall, William H.
  • Journal: Journal of Quality Technology