考虑上面的例子， ，When , 从而造成控制限收紧，导致控制图出现大

考虑上面的例子， ，When , 从而造成控制限收紧，导致控制图出现大量出界点，虚发警报错误较多。且比较图三、图五可知，样本偏倚越大，控制图虚发报警次数越多，控制效率越差。

Consider the example above, 'When', which leads to a tightening of the control limit, resulting in a large number of out of bounds points in the control chart, and more false alarm errors. Comparing Figures 3 and 5, it can be seen that the larger the sample bias, the more false alarms are generated in the control chart, and the poorer the control efficiency.

Consider the above example,, When, which causes the control limit to tighten, resulting in a large number of out-of-bounds points on the control chart and more false alarm errors. Compared with Figure 3 and Figure 5, it can be seen that the greater the sample bias, the more times the control chart gives false alarms, and the worse the control efficiency.