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arXiv 2202.11285cs.LGq-fin.STstat.ML
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神经广义AutoRegressive条件异方差性

Neural Generalised AutoRegressive Conditional Heteroskedasticity

University College London(伦敦大学学院)

Zexuan Yin, Paolo Barucca

摘要:

我们提出了神经神经GARCH,一类方法来模拟金融时间序列的条件异方差性。神经GARCH是单变量情况下GARCH 1,1模型和多变量情况下对角BEKK 1,1模型的神经网络适应。为了反映金融市场不断变化的动态,我们允许GARCH模型的系数随时间变化。时变系数由一个递归神经网络参数化,该网络是用随机梯度变分贝叶斯训练的。我们提出了我们的模型的两个变种,一个正常的创新和其他学生t创新。我们在广泛的单变量和多变量金融时间序列上测试了我们的模型,我们发现神经学生t模型始终优于其他模型。

英文摘要:

We propose Neural GARCH, a class of methods to model conditional heteroskedasticity in financial time series. Neural GARCH is a neural network adaptation of the GARCH 1,1 model in the univariate case, and the diagonal BEKK 1,1 model in the multivariate case. We allow the coefficients of a GARCH model to be time varying in order to reflect the constantly changing dynamics of financial markets. The time varying coefficients are parameterised by a recurrent neural network that is trained with stochastic gradient variational Bayes. We propose two variants of our model, one with normal innovations and the other with Students t innovations. We test our models on a wide range of univariate and multivariate financial time series, and we find that the Neural Students t model consistently outperforms the others.

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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