在使用管制圖監控製程時，常常存在顯著的測量誤差，因而影響管制圖的偵測能力。本文提出 管制圖的等尾與最短長度管制界限以及 管制圖的UMPU管制界限，並討論測量誤差對這些管制圖與一般常用的近似常態管制界限 管制圖和等尾管制界限 管制圖的影響。在大部分的情況，測量誤差的存在會降低管制圖的偵測能力，但是對 管制圖的三種管制界限與等尾管制界限 管制圖，在某些情況下會發生有測量誤差管制圖的檢定力比沒有測量誤差管制圖的檢定力大的奇怪現象，這種現象可以藉由增加樣本數來減少發生的機率；然而利用UMPU管制界限的 管制圖就不會發生這種奇怪現象。

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