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arXiv 2102.07425q-fin.ST
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比特币非对称波动率和多重分形的时变特性

Time-varying properties of asymmetric volatility and multifractality in Bitcoin

Tetsuya Takaishi

摘要:

本文采用滚动窗口方法研究了比特币日收益率的波动性和比特币市场的多重分形特性,并考察了波动不对称性与市场有效性之间的关系。虽然我们发现比特币的波动性存在反向不对称性,但其幅度会随着时间的推移而变化,最近它变得很小。这种不对称的波动模式也存在于更高频率的回报中。其他测量,如峰度,偏度,平均值,序列相关性和多重分形度,也随着时间的推移而变化。因此,我们认为比特币市场的属性主要取决于时间。我们研究效率相关的措施:赫斯特指数,多重分形度,峰度。我们发现,当这些措施代表市场是更有效的,波动不对称性减弱。对于最近的比特币市场,效率相关指标和波动不对称性都证明了市场变得更有效率。

英文摘要:

This study investigates the volatility of daily Bitcoin returns and multifractal properties of the Bitcoin market by employing the rolling window method and examines relationships between the volatility asymmetry and market efficiency. Whilst we find an inverted asymmetry in the volatility of Bitcoin, its magnitude changes over time, and recently, it has become small. This asymmetric pattern of volatility also exists in higher frequency returns. Other measurements, such as kurtosis, skewness, average, serial correlation, and multifractal degree, also change over time. Thus, we argue that properties of the Bitcoin market are mostly time dependent. We examine efficiency-related measures: the Hurst exponent, multifractal degree, and kurtosis. We find that when these measures represent that the market is more efficient, the volatility asymmetry weakens. For the recent Bitcoin market, both efficiency-related measures and the volatility asymmetry prove that the market becomes more efficient.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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