Breaking down the non-normality of stock returns

Breaking down the non-normality of stock returns
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打破股票收益的非正态性

DOI:
10.1080/13518470902872343
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发表时间:
2009
期刊:
The European Journal of Finance
影响因子:
--
通讯作者:
Karoglou M
Karoglou M
中科院分区:
--
文献类型:
--
作者:
Karoglou M

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本文考察了股市日收益率中典型的非正态现象是否会因为突变和GARCH效应的共同存在而出现。它提出了一种数据驱动的程序,以可信地确定中断的数量和时间,并将其应用于27个经合组织国家的基准股票市场指数。研究结果表明,所观察到的偏离常态的很大一部分可能确实是由于突变和GARCH效应共存所致。然而,结构变化的存在被发现是非常态的主要原因,而不是GARCH效应。此外,仍有一些剩余的过度峰度不太可能与条件波动率的规范或中断的存在联系在一起。最后,一个有趣的边线结果表明,GARCH模型在预测股市波动方面的能力有限。
This paper investigates whether the non-normality typically observed in daily stock-market returns could arise because of the joint existence of breaks and GARCH effects. It proposes a data-driven procedure to credibly identify the number and timing of breaks and applies it on the benchmark stock-market indices of 27 OECD countries. The findings suggest that a substantial element of the observed deviations from normality might indeed be due to the co-existence of breaks and GARCH effects. However, the presence of structural changes is found to be the primary reason for the non-normality and not the GARCH effects. Also, there is still some remaining excess kurtosis that is unlikely to be linked to the specification of the conditional volatility or the presence of breaks. Finally, an interesting sideline result implies that GARCH models have limited capacity in forecasting stock-market volatility.
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