Journal of the Korean Statistical Society

The Korean Statistical Society (한국통계학회)
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INFLUENCE OF SPECIAL CAUSES ON STOCHASTIC PROCESS ADJUSTMENT

  • Lee, Jae-June (Department of Statistics, Inha University) ;
  • Mihye Ahn (Department of Statistics, Inha University)
  • Published : 2004.06.01
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Abstract

Process adjustment is a complimentary tool to process monitoring in process control. Although original intention of process adjustment is not identifying a special cause, detection and elimination of special causes may lead to significant process improvement. In this paper, we examine the impact of special causes on process adjustment. The bias in the adjusted output process is derived for each type of special causes, and average run length (ARL) of the Shewhart chart applied to the adjusted output is computed for each special cause types. Numerical results are illustrated for the ARL of the Shewhart chart, thereupon seriousness of special causes on process adjustment is evaluated for each type of special causes.

Keywords

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