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arXiv 1809.08403q-fin.ST
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比特币市场的混乱与秩序

Chaos and Order in the Bitcoin Market

Josselin Garnier, Knut Solna

摘要:

比特币价格近年来飙升,也出现了快速衰减的阶段。在本文中,我们讨论了这个新的加密货币市场在多大程度上可以被视为经典或半有效市场的问题。用于估计多重分形属性的新颖而强大的工具被用来表明比特币价格呈现出非常有趣的多尺度相关结构。这种结构可以用收益率方差随时间增量的幂律行为来描述,它可以用两个参数来表征,波动率和赫斯特指数。然而,这些幂律参数随时间变化。引入了广义赫斯特指数的新概念,它允许我们检查底层信号的多重分形特征是否被很好地捕获。此外,还展示了如何使用幂律参数的监测来识别比特币价格的政权转移。提出了一种基于局部幂律参数拟合优度的区域切换识别方法。它会自动检测与比特币市场中一些已知事件相关的日期。此外,一个非常令人惊讶的结果是,尽管近年来比特币价格的疯狂上涨及其多重分形和非平稳特性,但当观察其整个存在期间时,该价格既具有局部幂律行为,又具有非常有序的相关结构。

英文摘要:

The bitcoin price has surged in recent years and it has also exhibited phases of rapid decay. In this paper we address the question to what extent this novel cryptocurrency market can be viewed as a classic or semi-efficient market. Novel and robust tools for estimation of multi-fractal properties are used to show that the bitcoin price exhibits a very interesting multi-scale correlation structure. This structure can be described by a power-law behavior of the variances of the returns as functions of time increments and it can be characterized by two parameters, the volatility and the Hurst exponent. These power-law parameters, however, vary in time. A new notion of generalized Hurst exponent is introduced which allows us to check if the multi-fractal character of the underlying signal is well captured. It is moreover shown how the monitoring of the power-law parameters can be used to identify regime shifts for the bitcoin price. A novel technique for identifying the regimes switches based on a goodness of fit of the local power-law parameters is presented. It automatically detects dates associated with some known events in the bitcoin market place. A very surprising result is moreover that, despite the wild ride of the bitcoin price in recent years and its multi-fractal and non-stationary character, this price has both local power-law behaviors and a very orderly correlation structure when it is observed on its entire period of existence.

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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