若製程的品質特性是由反應變數與一個或多個解釋變數間的某種關係所定義，則我們將這種關係稱之為輪廓。在本文中我們將考慮卜瓦松迴歸輪廓製程的監控，有別於傳統EWMA管制圖的作法，我們是利用極大化自然對數概似函數的指數加權移動平均來估計輪廓中的參數，並利用此估計量來建構管制圖，然後與傳統的EWMA管制圖做比較。在製程出現失控訊號後，我們將在不同管制圖下來比較製程的改變點的估計值和正確診斷是那個或那些參數的變動而造成製程的變異的準確率。最後我們會舉一個例子來說明實際上如何執行上述的管制圖。

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