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arXiv 0708.4178q-fin.STphysics.soc-ph
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股票价格变动有效度与预测的关系

Relationship between degree of efficiency and prediction in stock price changes

Cheoljun Eom, Gabjin Oh, Woo-Sung Jung

摘要:

本研究利用27个股票市场的指数,实证检验股票市场市场有效性的高低是否与其对未来价格变化的预测能力有关。有效性是指以过去价格变化信息为基础的弱式有效市场假说。预测能力对应于命中率,命中率是实际价格变化的方向与预测的方向之间的一致性的比率,通过使用样本外的最近邻预测方法(NN方法)计算。在本文中,赫斯特指数和近似熵(ApEn)被用来作为效率程度的定量度量。反映各种时间相关性的赫斯特指数与反映时间序列随机性的近似熵值之间呈负相关关系。而对未来价格变化方向的平均预测能力与赫斯特指数有较强的正相关关系,与近似熵有较强的负相关关系。因此,当我们使用过去的价格变化模式分析市场时,市场有效性较低的市场指数比市场有效性较高的市场指数对未来价格变化具有更高的预测能力。此外,我们表明,赫斯特指数,长期记忆属性的测量,提供了更重要的信息,在未来的价格变化的预测比近似熵和NN方法。

英文摘要:

This study investigates empirically whether the degree of stock market efficiency is related to the prediction power of future price change using the indices of twenty seven stock markets. Efficiency refers to weak-form efficient market hypothesis (EMH) in terms of the information of past price changes. The prediction power corresponds to the hit-rate, which is the rate of the consistency between the direction of actual price change and that of predicted one, calculated by the nearest neighbor prediction method (NN method) using the out-of-sample. In this manuscript, the Hurst exponent and the approximate entropy (ApEn) are used as the quantitative measurements of the degree of efficiency. The relationship between the Hurst exponent, reflecting the various time correlation property, and the ApEn value, reflecting the randomness in the time series, shows negative correlation. However, the average prediction power on the direction of future price change has the strongly positive correlation with the Hurst exponent, and the negative correlation with the ApEn. Therefore, the market index with less market efficiency has higher prediction power for future price change than one with higher market efficiency when we analyze the market using the past price change pattern. Furthermore, we show that the Hurst exponent, a measurement of the long-term memory property, provides more significant information in terms of prediction of future price changes than the ApEn and the NN method.

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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