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Continuity Adjustment for Control Charts for Attributes
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作者 L.K.Chan T.K.Mak B.Tao 《Acta Mathematicae Applicatae Sinica》 SCIE CSCD 2003年第3期397-404,共8页
A unified approach is proposed for making a continuity adjustment on some control charts for attributes, e.g., np-chart and c-chart, through adding a uniform (0, 1) random observation to the conventional sample statis... A unified approach is proposed for making a continuity adjustment on some control charts for attributes, e.g., np-chart and c-chart, through adding a uniform (0, 1) random observation to the conventional sample statistic (e.g., and c <SUB>i </SUB>). The adjusted sample statistic then has a continuous distribution. Consequently, given any Type I risk &#945; (the probability that the sample statistic is on or beyond the control limits), control charts achieving the exact value of &#945; can be readily constructed. Guidelines are given for when to use the continuity adjustment control chart, the conventional Shewhart control chart (with ±3 standard deviations control limits), and the control chart based on the exact distribution of the sample statistic before adjustment. 展开更多
关键词 control charts for attributes continuity adjustments np p and c control charts statistical process control
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