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Independent component analysis for realized volatility: Analysis of the stock market crash of 2008

机译:独立成分分析以实现波动性:2008年股市崩盘分析

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This paper investigates the factors that drove the U.S. equity market returns from 2007 to early 2010. The period was highlighted by volatile energy and commodity prices, the collapse of insurance and banking firms, extreme implied volatility and a subsequent rally in the overall market. To extract the driving factors, we decompose the returns of the S&P500 sector ETFs into statistically independent signals using independent component analysis. We find that the generated factors have interesting financial interpretations and are consistent with the major economic themes of the period. We find that there are two sets of general market betas during the period along with a dominant factor for energy and materials sector. In addition, we find that the EGARCH model which accommodates asymmetric responses between returns and volatility can plausibly fit the high levels of variance during the crash. Finally, estimated correlations dropped when commodity prices moved higher, but then spiked when the S&P500 crashed in late 2008.
机译:本文研究了从2007年到2010年初推动美国股票市场回报的因素。这一时期的特点是能源和商品价格波动,保险和银行公司倒闭,极高的隐含波动率以及随后整个市场的反弹。为了提取驱动因素,我们使用独立的成分分析将S&P500行业ETF的回报分解为统计上独立的信号。我们发现,产生的因素具有有趣的财务解释,并且与该时期的主要经济主题相一致。我们发现,在此期间,有两套一般市场的beta版本,以及能源和材料行业的主导因素。另外,我们发现,适应收益率和波动率之间不对称响应的EGARCH模型可以合理地拟合崩溃期间的高方差。最后,当大宗商品价格上涨时,估计的相关性下降,但是当标准普尔500指数在2008年末崩溃时,相关性急剧上升。

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