Journal of Korean Society for Quality Management (품질경영학회지)

Korean Society for Quality Management (한국품질경영학회)
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EWMA Control Charts with Variable Parameter

가변모수를 갖는 EWMA 관리도

  • Lee, Jae-Heon (Faculty of Math-Statistics, Chung-Ang University) ;
  • Han, Jung-Hee (Faculty of Math-Statistics, Chung-Ang University)
  • 이재헌 (중앙대학교 수학통계학부) ;
  • 한정희 (중앙대학교 수학통계학부)
  • Published : 2005.12.31
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Abstract

Variable sampling rate(VSR) scheme varies the sampling rate for the current sample depending on the previous value of the control statistic. In this paper, we propose EWMA control charts with variable parameter(VP) scheme, which allows both the sample rate(the sample size or the sampling interval) and the weight to vary. We investigate the effectiveness of the VP scheme relative to the fixed parameter(FP) scheme and the VSR scheme in EWMA control charts. It is shown that using the VP scheme gives some improvements to the ability in detecting small and moderate shifts in the process normal mean.

Keywords

References

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