NO.PZ2015121810000012
问题如下:
What is the maximum Sharpe ratio that a manager can achieve by combining the S&P 500 benchmark portfolio and the Indigo Fund?
选项:
A.0.333
B.0.365
C.0.448
解释:
B is correct.
The highest squared Sharpe ratio of an actively managed portfolio is:
{$table2}The highest Sharpe ratio is
{$table3}考点:Sharpe ratio
解析: 求得是Indigo Fund与benchmark组合后的maximum Sharpe ratio。由于combined portfolio的IR不受激进程度的影响,因此无论当前的active risk是否处于optimal amount,IR的值不变。代入公式:
因此,SR=0.365。
SR²=SRB²+IR²,这个公式在强化串讲里没提到过啊,这个公式的原理是什么?