After that, we can discern which is user churn incline characteristic, we can summarize these characteristics, and to predict a user's churn behavior.

当我们学习到这些可以识别用户有无离网倾向的特征后，可以归纳、总结这些特征，并用使用它们来预测一个用户的行为。

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4 user research: the research of user behavior, such as user life cycle, user churn analysis, user value analysis, etc. ;

用户研究：研究用户生命周期、用户流失预警、用户价值分析等相关用户行为研究；并依此建立数学模型，撰写分析报告；

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