unusual events

vibration: 振动
Density estimation:

Gaussian(normal) Distribution.

standard deviation: 标准差
variance deviation
sigma
Mu

Parameter estimation

Anomaly detection algorithm

少量异常样本点的处理经验

algorithm evaluation

skewed datatsets: 倾斜数据集

Anomaly detection vs. supervised learning

Choose feature

• Non-gaussian features
  

Choosing features