那年那月 发表于 2016-6-6 22:01
short extension貌似是做空差的股票得来的钱去买好公司的股票吧。应该会影响贝塔。不知道有没有陷阱
A good way to think about this is that you can keep your beta unchanged, and add alpha by adding the short extension. The combination of the 20% short and additional 20% long will keep your beta unchanged if you desire while allowing you to capture additional alpha through the short position.
来自analyst forum