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本文利用随机变量的标准变换,将各类控制图(管理图)简化统一为通用控制图:UCL=+3,CL=0,LCL=-3,并利用直接打点法,借助预先计算好的直接打点表或曲线使现场人员在控制图上打点时不需任何计算,非常方便。 现行x、x、p、u图用于样本大小n变化的情况下,界限呈凹凸状,不但作图不便而且难以判断是否异常。至于pn图则不适用于n变化的情况。本文方法可克服上述弊病从而扩大控制图的应用范围和提高判断准确性。
In this paper, the standard transformation of random variables, the various types of control chart (management chart) simplified unified control chart: UCL = +3, CL = 0, LCL = -3 and the use of direct management method, with pre-calculated direct RBI tables or curves make the site staff in the control chart RBI without any calculation, very convenient. The current x, x, p, u maps for the sample size n changes, the boundaries were uneven, not only the plot inconvenient and difficult to determine whether abnormal. The pn diagram does not apply to n changes. This method can overcome the above shortcomings and thus expand the scope of application of control charts and improve the accuracy of judgment.