Structural Learning with Time-Varying Components: Tracking the Cross-Section of Financial Time Series
含时变成分的结构学习:追踪金融时间序列的横截面结构AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确以金融数据的时变协方差为对象,并将方法与多元随机波动率模型联系起来。
含时变成分的结构学习:追踪金融时间序列的横截面结构AI 解读 ↓
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Summary When modelling multivariate financial data, the problem of structural learning is compounded by the fact that the covariance structure changes with time. Previous work has focused on modelling those changes by using multivariate stochastic volatility models. We present an alternative to these models that focuses instead on the latent graphical structure that is related to the precision matrix. We develop a graphical model for sequences of Gaussian random vectors when changes in the underlying graph occur at random times, and a new block of data is created with the addition or deletion of an edge. We show how a Bayesian hierarchical model incorporates both the uncertainty about that graph and the time variation thereof.