Journal of Korean Society for Quality Management (품질경영학회지)
- Volume 22 Issue 4
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- Pages.13-27
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- 1994
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- 1229-1889(pISSN)
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- 2287-9005(eISSN)
Exponentially Weighted Moving Average Control Charts for Counted Data
계수치 데이터를 위한 EWMA 관리도
- An, Dong-Geun (Dept. of Industrial Engineering, Ajou University) ;
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Jang, Joong-Soon
(Dept. of Industrial Engineering, Ajou University)
- Published : 1994.12.01
Abstract
This study is concerned with design of EWMA control charts for counted data. Control charts for the fraction defective and the number of defects are designed. Performance analysis is accomplished for validity of the designed EWMA control charts. Average run length(ARL) is adopted as a criterion for comparison. Simulation results show that the designed EWMA control charts have shorter ARL than pn, p and c control charts when the fraction nonconforming or the average defect number are shifted. This means that the designed control charts can detect the out of -control state of the process more fastly than the traditional control charts.
Keywords