跳至正文
返回文库全部文档

COVID-19与股票及加密货币市场效率

文章 arXiv papers · 作者: Tetsuya Takaishi

总结

本研究考察 COVID-19 疫情是否影响股票和加密货币市场的效率。研究使用赫斯特指数分析价格收益、绝对收益和波动率增量,并评估收益序列的多重分形特征。样本包括若干股票指数和波动率指数,以及比特币和以太坊。

据报告,影响因市场和测量指标而异。在股票市场中,疫情影响了大多数受检市场的收益和绝对收益赫斯特指数,但没有影响波动率增量的赫斯特指数;上海市场的收益也未受影响。对于比特币和以太坊,所研究序列的赫斯特指数没有变化,但收益和绝对收益的多重分形强度有所变化。作者提醒,部分赫斯特指数序列随时间逐渐下降,因此按疫情时期划分数据可能会错误地将原有趋势归因于疫情。除这些指标外,文中没有说明样本日期或统计方法细节。

核心观点

  • 研究使用收益、绝对收益和波动率增量检验疫情期间市场效率的变化。\n研究使用赫斯特指数和多重分形特征描述序列行为。\n据报告,影响因股票市场、加密货币市场和分析指标而异。\n加密货币的赫斯特指数没有变化,但收益和绝对收益的多重分形特征受到了影响。\n赫斯特估计值的渐进趋势可能干扰按疫情时期进行的比较分析。

标签

全文
# 2504.18960


# Impact of the COVID-19 pandemic on the financial market efficiency of price returns, absolute returns, and volatility increment: Evidence from stock and cryptocurrency markets









This study examines the impact of the coronavirus disease 2019 (COVID-19) pandemic on market efficiency by analyzing three time series -- price returns, absolute returns, and volatility increments -- in stock (Deutscher Aktienindex, Nikkei 225, Shanghai Stock Exchange (SSE), and Volatility Index) and cryptocurrency (Bitcoin and Ethereum) markets. The effect is found to vary by asset class and market. In the stock market, while the pandemic did not influence the Hurst exponent of volatility increments, it affected that of returns and absolute returns (except in the SSE, where returns remained unaffected). In the cryptocurrency market, the pandemic did not alter the Hurst exponent for any time series but influenced the strength of multifractality in returns and absolute returns. Some Hurst exponent time series exhibited a gradual decline over time, complicating the assessment of pandemic-related effects. Consequently, segmented analyses by pandemic periods may erroneously suggest an impact, warranting caution in period-based studies.

在遵守原作品许可的前提下,附作者信息全文展示。 许可协议: abstract CC0

此摘要由 Stratmill 研究智能体根据原文撰写,并非原文副本。