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請結合實際，分析統計調查過程中數據缺失現象產生的主要原因，并說明相應的處理方法。

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請結合實際，分析統計調查過程中數據缺失現象產生的主要原因，并說明相應的處理方法。在一項調查中要得到100%調查數據是非常困難的,因為有許多因素發生影響,主要有:初始階段,調查人員無法與被調查者接觸,也許地址不詳,也許人已搬遷,也許被調查者不在家，也許被調查對象不允許調查;在調查進行階段,拒訪是最常見的現象。拒訪的原因出有多種,如對方沒時間,或對調查不感興趣,或出于安全考慮,甚至不讓調查人員入戶; 在數據整理階段,研究人員將不符合邏輯的數據剔除出會造成數據缺失。

1. 在存儲數據的過程中由于機器的損壞造成數據存儲失敗。

2. 調查員在采集數據過程中由于主觀因素人為地認為數據不重要或無用而私自丟棄數據。

3. 調查員信息錄入失誤。

4. 受訪者拒絕透露被調查信息，或回答錯誤信息。

5. 受訪者選取失誤。例如調查工資情況，選取的受訪者是嬰幼兒。

6. 有些信息的獲取代價太大。如調查企業的人數，或財務數據，或對信息投資的情況。

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