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arXiv 2109.01044q-fin.STcs.LG
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混合GARCH-LSTM预测资产收益的高维协方差矩阵

Forecasting High-Dimensional Covariance Matrices of Asset Returns with Hybrid GARCH-LSTMs

Université Paris-Dauphine - PSL(巴黎第九大学(巴黎多菲纳大学)- PSL);Sorbonne Université(索邦大学)

Lucien Boulet

摘要:

一些学者研究了混合模型的能力,混合单变量广义自回归条件异方差(GARCH)模型和神经网络提供更好的波动性预测比纯粹的计量经济模型。尽管提出了非常有前途的结果,这种模型的推广到多变量的情况下,还有待研究。此外,很少有论文研究神经网络预测资产收益协方差矩阵的能力,并且所有论文都使用了相当少量的资产,因此没有解决所谓的维数灾难。本文的目的是研究混合模型,混合Gestival过程和神经网络,预测资产收益率的协方差矩阵的能力。为此,我们提出了一个新的模型,基于多变量GARCH分解波动性和相关性预测。波动率在这里使用混合神经网络预测,而相关性遵循传统的计量经济学过程。在最小方差投资组合框架下实现模型后,我们的结果如下。首先,添加Gestival参数作为输入对所提出的模型是有益的。其次,使用one-hot-encoding来帮助神经网络区分每只股票,提高了性能。第三,提出的新模型是非常有前途的,因为它不仅优于同等权重的投资组合,而且还通过一个显着的利润率的计量经济学对应,使用单变量GARCH预测波动率。

英文摘要:

Several academics have studied the ability of hybrid models mixing univariate Generalized Autoregressive Conditional Heteroskedasticity (GARCH) models and neural networks to deliver better volatility predictions than purely econometric models. Despite presenting very promising results, the generalization of such models to the multivariate case has yet to be studied. Moreover, very few papers have examined the ability of neural networks to predict the covariance matrix of asset returns, and all use a rather small number of assets, thus not addressing what is known as the curse of dimensionality. The goal of this paper is to investigate the ability of hybrid models, mixing GARCH processes and neural networks, to forecast covariance matrices of asset returns. To do so, we propose a new model, based on multivariate GARCHs that decompose volatility and correlation predictions. The volatilities are here forecast using hybrid neural networks while correlations follow a traditional econometric process. After implementing the models in a minimum variance portfolio framework, our results are as follows. First, the addition of GARCH parameters as inputs is beneficial to the model proposed. Second, the use of one-hot-encoding to help the neural network differentiate between each stock improves the performance. Third, the new model proposed is very promising as it not only outperforms the equally weighted portfolio, but also by a significant margin its econometric counterpart that uses univariate GARCHs to predict the volatilities.

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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