But, on the other hand, you don't want high variance because that's risk; so, both of those matter.

但另一方面，你不想要高水平的方差,因为它代表风险;,因此这两个参数都很重要。

耶鲁公开课 - 金融市场课程节选

We want a high expected value of returns, but we don't like variance.

我们希望收益的期望值较高,并且稳定

耶鲁公开课 - 金融市场课程节选