Level 3, Book 3, 6.2 The Resampled Efficient Frontier
一直都不太明白这个Resampled Efficient Frontier是怎么构成的?了解的Tx能不能给讲解一下,非常感谢!
a resampled efficient portfolio for a given return rank as the portfolio defined by the average weights on each asset class for simulated efficient portfolios with that return rank. For example, the fifth-ranked resampled efficient portfolio is defined by the average weight on each of the asset classes for the fifth-ranked simulated efficient portfolios in the individual simulation trials. Averaging weights in this fashion preserves the property that portfolio weights sum to 1, but has been challenged on other grounds. The set of resampled efficient portfolios represents the resampled efficient frontier.
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搜索了一下,发现前两年已经有牛人Nameton讲解过,现贴上来供大家参考:
所谓的RESAMPLING METHOD本质上也是一种SIMULATION ,只不过其随机抽取的是历史的回报数据,而不是计算机产生的随机数,这种模拟法又叫“自举”bootstrapping。一次完整的模拟过程大致是:在每次进行历史数据抽样后,先按照MVO法则得到有效组合。这样会有很多个有效组合。再按照有效组合的预期收益率对有效组合进行排序,把预期收益率相同的有效组合编为一组,取单个资产在这组有效组合中的权重的算术平均值为新的权重,这样会得到一个新的加权有效组合,再计算这个新组合的预期收益率和方差,得到均值——方差坐标轴上的一个点。重复第二部,直到处理完所有的相同预期收益率对应的有效组合分组为止。最后把上述所有的均值——方差坐标轴上的点连接起来,就是RESAMPLED EFFICIENT FORNTIER 。
[此贴子已经被作者于2011-5-24 11:44:40编辑过] |