Rare Event Analysis
2016-03-03 21:50
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本文链接:https://blog.csdn.net/theotherguy/article/details/50792008
Background
Drowning in data, starving for knowledge.
如同矿石提炼黄金的过程,大量的数据中,只蕴含了少量有趣的事件。这些少量事件中,出现频次相对更低的稀有事件,可能导致显著的结果,且往往是负面的。
应用
- 网络入侵检测
- 信用卡欺诈检测
- 病理诊断
传统策略在稀有事件分析中的不足
以网络KPI问题定位为例:
- 异常点处理:考虑KPI问题点和数据打点问题点的区别;
- 特征选取和提取:
> a <- c(rnorm(100), 15) > b <- c(rnorm(100), 15) > cor(a, b, method ="spearman") [1] 0.1072103 > cor(a, b, method = "pearson") [1] 0.7590896
- 评估标准不适用
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