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西红柿面 · 2024年06月16日

关于Put Option的解释

NO.PZ2022062601000016

问题如下:

Fund A invests in many different hedge fund strategies. The factor sensitivities for Fund A during normal conditions and crisis conditions are highlighted in Exhibit 1. At the 5% level, all exposures are significant.

Exhibit 1.

Fund A Coefficients

Bourne,the risk control director of Fund A draws the following conclusions from Exhibit 1:

Which of Bourne’s observations about Fund A is most likely accurate?

选项:

A.

Observation 1

B.

Observation 2

C.

Observation 3

解释:

C is correct. For Fund A, adding deep out-of-the-money puts during periods of market stress would explain why the correlation with equity markets is relatively neutral in normal markets but is significantly negative during periods of crisis. It also is supported by a large increase in positive correlation with volatility during periods of crisis.

A is incorrect. Fund A is unlikely to have a dedicated short bias strategy, as its sensitivity to the equity market is essentially zero except during crisis periods.

B is not correct. Fund A has a positive exposure to volatility through the VIX, especially during periods of market pressure. This does not mean that managers will sell puts against short positions.

知识点考察:Portfolio Contribution of Hedge Fund Strategies

A选项,dedicated short bias是指完全做空,那么其和沪深300的系数值应该是负的。虽然normal的时候是是负的,但是-0.03,基本等于没有,所以与其说是dedicated short bias感觉更想EMN。所以A不对。

B选项。说是卖出期权。期权和波动率是正比,这时如果卖出期权,那么就是和波动是反比。crisis时期是高波动的,那么应该系数是小的,但是CRISIS的时候VIX的波动是增加的。所以不对。

C选项,其描述简单是说持有PUT,也就是option,还是和B解题思路一样。PUToption,与波动成正比,CRISIS的时候是高波动,所以这个时候应该系数是增加的。而表格的VIXcrisisnormal高(0.470.15),所以证明C是对的

这个题看实施的策略是什么。通过回归系数(对每个参数的敏感性)来判断其是什么策略。

观察1说实施的策略应该是dedicated short bias策略,如果是做空,那么其应该只是和指数沪深300的系数关系应该是-0.5以上,即和指数沪深300的关系是负的,但是观察显示-0.03,几乎属于和沪深300没有关系,那么应该是几乎没有β了,可能是EMN或者事件驱动策略。

观察2说卖出期权。期权的特点是和波动成正比,卖出期权那么就是和波动成反比,但是显示其和波动成正比所以不对。

观察3说是持有的put,那么就是和指数涨跌是相反的,指数涨,put就跌,指数跌,put就涨,这个没问题对吧,所以沪深300在crisis的时候肯定是跌的对吧,如果这个时候和沪深300关系是负的(-0.5),那么证明这个时候这个策略是涨的,PUT对应了。还有就是PUT是option,与波动成正比,CRISIS的时候是高波动,所以这个时候应该系数是增加的。而表格的VIX的crisis比normal高(0.47>0.15),所以证明C是对的。

它在沪深300下跌的时候,和沪深300关系是负的(-0.5),那么证明这个时候这个策略是涨的。Put的时候,index上涨,Put也上涨我懂,但是表格里的数字是-0.5呀,-0.5是怎么判断出来时上涨的?

1 个答案
已采纳答案

伯恩_品职助教 · 2024年06月16日

嗨,爱思考的PZer你好:


-0.5啊,以为着在沪深300下跌1%,fund A上涨0.5%啊。刚好是相反的

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