问题如下图:
选项:
A.
B.
C.
解释:
线性关系下降,但强弱不是看绝对值么,说明线性变强,则diversification 不是更弱么?
菲菲_品职助教 · 2018年08月26日
同学你好,这道题目可以这么理解,这道题的点不在于线性关系的强弱,而在于原版书中有一句描述说,如果两个资产之间的协方差越小,风险就越小,分散化收益就越大,也就意味着相关系数越小,分散化收益就越大。也可以通过量化的角度来分析,一个投资组合计算方差的公式为
相关系数ρ为负,说明协方差一定是负数,那么组合的方差就小于相关系数等于0时的方差,就意味着相关系数为-1的组合的风险低于相关系数为0的组合的风险,那么分散化收益就增加了。
冯有为 · 2018年11月01日
老师,协方差的取值大小与风险有关吗?
菲菲_品职助教 · 2018年11月02日
有关吖,协方差越大组合的风险越大。
NO.PZ2018062016000071 问题如下 When the correlation between two stocks creases from 0 to -1, the versification benefit will: A.increase. B.crease. C.remain the same. A is correct. the correlation between two stocks creases, versification effemenhananversification benefit will increase. analyst gathers the following information:Whisecurity hthe highest totrisk?
NO.PZ2018062016000071 问题如下 When the correlation between two stocks creases from 0 to -1, the versification benefit will: A.increase. B.crease. C.remain the same. A is correct. the correlation between two stocks creases, versification effemenhananversification benefit will increase. 这个问题考的概念是不是就是correlation coefficient的绝对值越大,线性关系越强?
NO.PZ2018062016000071 问题如下 When the correlation between two stocks creases from 0 to -1, the versification benefit will: A.increase. B.crease. C.remain the same. A is correct. the correlation between two stocks creases, versification effemenhananversification benefit will increase. 如果说correlation,p 从0 变成了-1 ,虽然说他们之间的相关性变的很强了,但是是inverse的,所以是对投资分散有好处,是这样理解吗?
NO.PZ2018062016000071 问题如下 When the correlation between two stocks creases from 0 to -1, the versification benefit will: A.increase. B.crease. C.remain the same. A is correct. the correlation between two stocks creases, versification effemenhananversification benefit will increase. 这个题目这里,variance下降,说明组合versification分散,风险低。但是离散程度跟这个题目有关吗这两个概念有点模糊感谢回答
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