请问使用X-MR管制图时，Out of control准则是什么？

Because moving ranges are involved, the points being plotted on the range chart are correlated. Therefore, valid signals occur only in the form of points beyond the control limits. Other rules used to evaluate the data for non-random patters are not reliable indicators of out-of-control conditions."

由于移动极差比较复杂，绘制在极差图上的点之间相互关联。所以，正确的信号仅以超过控制限的形式出现。用于评估非随机模式的其它准则对于指示失控状态并不可靠。

原来有这种说法，缺少学习了。加紧