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Journal of Korean Society for Quality Management 1997;25(3): 74-. |
| p관리도의 불량률의 변화 탐지 |
| 장경, 양문희 |
| 단국대학교 산업공학과 |
| Detection of Changes of the Population Fraction Nonconforming in the p Control Chart |
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| ABSTRACT |
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In this paper we calculate the subgroup size necessary for detecting the change of percent defective with several detection probabilities for orginal population fraction nonconforming p, changed population fraction nonconforming $p^*$, and the ratio k=$p^*$/p in the usage of p control charts. From our calculation we can know the error level of normal a, pp.oximation in detection probability calculation and recommend the subgroup size with lower error levels of normal a, pp.oximation, and then we show the reasonable subgroup size necessary for p, $p^*$, k, and the detection probability of the change of fraction nonconforming in a process. The information that we here show in tables will be useful when p control chart users decide the subgroup size in the p control chart users decide the subgroup size in the p control chart. |
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