VAR So, people talk about VAR, value at risk, and lots of people try and build VAR systems.

所以，人们总是讨论，即风险收益，而且有很多人试图建立风险收益系统。

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Expected value is good and variance is bad because that's risk; that's uncertainty.

期望值越高越好,方差就相反,因为方差代表着风险,也就是不确定性

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