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。
Once you've got them together, then you can compute the efficient portfolio frontier without the riskless asset.
当你明确了这些参数后,就可以算出没有无风险资产情况下的,有效边界了。
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