Bespoke realized volatility: Tailored measures of risk for volatility prediction
定制已实现波动率:面向波动率预测的风险度量AI 解读 ↓
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定制已实现波动率:面向波动率预测的风险度量AI 解读 ↓
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Standard realized volatility (RV) measures estimate the latent volatility of an asset price using high frequency data with no reference to how or where the estimate will subsequently be used. This paper presents methods for “tailoring” the estimate of volatility to the application in which it will be used. For example, if the volatility measure will be used in a specific parametric forecasting model, it may be possible to exploit that knowledge to construct a better measure of volatility. We use methods from machine learning to estimate optimal “bespoke” RVs for heterogeneous autoregressive (HAR) and GARCH-X forecasting applications. We apply the methods to 886 U.S. stock returns and find that bespoke RVs significantly improve out-of-sample forecast performance. We find that, across a variety of volatility models, the bespoke RV places more weight on data from the end of the trade day, and that the optimal bespoke weights can be well-approximated by a simple parametric function.
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深度学习增强的 Realized GARCH 模型
We propose a new approach to volatility modeling by combining deep learning (LSTM) and realized volatility measures. This LSTM-enhanced realized GARCH framework incorporates and distills modeling advances from financial econometrics, high frequency trading data and deep learning. Bayesian inference via the Sequential Monte Carlo method is employed for statistical inference and forecasting. The new framework can jointly model the returns and realized volatility measures, has…
广义自回归得分树与森林
We propose methods to improve the forecasts from generalized autoregressive score (GAS) models (Creal et. al, 2013; Harvey, 2013) by localizing their parameters using decision trees and random forests. These methods avoid the curse of dimensionality faced by kernel-based approaches, and allow one to draw on information from multiple state variables simultaneously. We apply the new models to four distinct empirical analyses, and in all applications the proposed new methods…
网络实现 GARCH–Itô 模型:基于高频识别的波动率溢出
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用于高维协方差矩阵的层级 DCC-HEAVY 模型
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