电信产业中「客户流失」（churn）与「无客户流失」通常以抬升曲线表示。 抬升曲线描绘出在门槛以上所有具流失可能之客户比例，相对的是门槛以上所有 具流失可能之电话用户（subscribers）比例。该抬升曲线指出，若能联系一定比 例的电话用户，则可捕捉所有流失客户之比例。既然电信媒体（carrier）客服中 心员工数目有限，仅能联系特定比例之电话用户，则能用以概算流失客户比例的 抬升曲线在电信产业中裨益良多。 　　能清楚区别流失客户与非流失客户之抬升曲线，以及在5%客户流失率不能区 别流失客户与非流失客户之抬升曲线分别如图8(a)与8(b)所示。前者我们称作完 全客户流失指标（perfect churn rate）後者随机客户流失指标（random churn rate）… ※ 引述《tias2277 (讨厌念书)》之铭言： : 请帮帮我翻译一下 : 我真的看不懂 他的意思 : 谢 : 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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