Tree-structured Generalized Autoregressive Conditional Heteroscedastic Models
树结构广义自回归条件异方差模型AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确针对金融时间序列波动率,采用带多阈值树结构的 GARCH 动态模型。
树结构广义自回归条件异方差模型AI 解读 ↓
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Summary We propose a new generalized autoregressive conditional heteroscedastic (GARCH) model with tree-structured multiple thresholds for the estimation of volatility in financial time series. The approach relies on the idea of a binary tree where every terminal node parameterizes a (local) GARCH model for a partition cell of the predictor space. The fitting of such trees is constructed within the likelihood framework for non-Gaussian observations: it is very different from the well-known regression tree procedure which is based on residual sums of squares. Our strategy includes the classical GARCH model as a special case and allows us to increase model complexity in a systematic and flexible way. We derive a consistency result and conclude from simulation and real data analysis that the new method has better predictive potential than other approaches.