Impact of Special Causes on EWMA Feedback Process Adjustment

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Journal of Korean Society for Quality Management > Volume 31(2); 2003 > Article

Journal of Korean Society for Quality Management 2003;31(2): 183-.

EWMA 피드백 공정 조정에서 이상원인의 영향

이재준¹, 전상표², 이종선¹

¹인하대학교 통계학과
²남서울대학교 교양학과

Impact of Special Causes on EWMA Feedback Process Adjustment

ABSTRACT

A special cause producing temporary deviation in the underlying process can influence on process adjustment in responsive feedback control system. In this paper, the impact of special causes on the EWMA(Exponentially Weighted Moving Average) forecasts and the process adjustment that is based on the EWMA forecasts are derived. For some special causes with patterned type of contamination, the influence of the causes on the output process are explicitly investigated. A data set, contaminated by a special cause of level shift, is analyzed to evaluate the impact numerically.

Key Words: Process Adjustment;Responsive Feedback Control;Special Cause;