A firm manages an investment portfolio consisting of manynewly-IPOed stocks as well as options on stocks. Management would like todetermine the VAR for this portfolio, and which one of the following VARmethods should be used?
Analytical method
Historical method
Monte Carlo simulation method
Correct Answer: C
【解析】
这道题主要是比较用于计算VAR的三种方法。Analyticalmethod假设portfolio的return是正态分布的。Historical method不要求portfolio的return一定要是正态分布的,但需要有大量的历史数据。在Monte Carlosimulation中,我们可以任意设定portfolio的return概率分布,但缺点是成本比较高和可能存在garbage in, garbage out的情况。
在这道题中,portfolio中含有option,而option会导致portfolioreturn产生skewness(偏态),变成非正态分布,因此Analytical method不适用。而portfolio中含有的很多newly-IPOedstocks,这些股票的历史数据必然缺乏,所以Historicalmethod也不适用。所以只能用Monte Carlo simulation来计算。
来自:Finance365CFA