電信產業中「客戶流失」（churn）與「無客戶流失」通常以抬升曲線表示。 抬升曲線描繪出在門檻以上所有具流失可能之客戶比例，相對的是門檻以上所有 具流失可能之電話用戶（subscribers）比例。該抬升曲線指出，若能聯繫一定比 例的電話用戶，則可捕捉所有流失客戶之比例。既然電信媒體（carrier）客服中 心員工數目有限，僅能聯繫特定比例之電話用戶，則能用以概算流失客戶比例的 抬升曲線在電信產業中裨益良多。 　　能清楚區別流失客戶與非流失客戶之抬升曲線，以及在5%客戶流失率不能區 別流失客戶與非流失客戶之抬升曲線分別如圖8(a)與8(b)所示。前者我們稱作完 全客戶流失指標（perfect churn rate）後者隨機客戶流失指標（random churn rate）… ※ 引述《tias2277 (討厭唸書)》之銘言： : 請幫幫我翻譯一下 : 我真的看不懂 他的意思 : 謝 : In the telecommunications industry, : the “churn”and “no churn” prediction is : usually expressed as a lift curve. : The lift curve plots the fraction of all churners : having churn probability above the threshold : against the fraction of all subscribershaving : churn probability above the threshold. : The lift curve indicates the fraction of all churners : can be caught if a certain fraction of all subscribers were contacted. : Since the customer services centers of a carrier : only have a fixed number of staff that is : able to contact a fixed fraction of all subscribers, : the lift curve, which can estimate the fraction of churners : can becaught given the limited resources, is very useful in : the telecommunications industry. : The lift curve representing perfect discrimination of : churners from nonchurners and that representing : no discrimination of churners from nonchurners : under a churn rate of 5% are shown in Fig. 8(a) and (b), respectively. : We refer to the former and the latter as : perfect churn predictor and random churn predictor --

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