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Unit and Group-Runs Chart to Identify Increases in Fraction Nonconforming

Summary: [This abstract is based on the authors' abstract.]The unit and group runs (UGR) control chart is proposed to detect an increase in fraction nonconforming. The chart begins with unit-level inspection, switches to group-level inspection, then returns to unit-level inspection according to a specified rule. The UGR chart nearly reaches the lower bound for the out-of-control average time to signal and is expected to outperform other attribute control charts. Steady-state performance is also superior, making the chart effective for statistical process control.

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  • Topics:
  • Keywords: Average run length (ARL),Average time to signal,Bernoulli trials,Cumulative sum control chart (CUSUM),Poisson distribution,Steady state processes,np (number of units) chart
  • Author: Gadre, M.P.; Rattihalli, R.N.
  • Journal: Journal of Quality Technology