A flexible predictive density combination for large financial data sets in regular and crisis periods
常态与危机时期大型金融数据集的灵活预测密度组合AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确以美国股票收益预测密度及其组合为对象,但未明确研究尾部或系统性风险。
常态与危机时期大型金融数据集的灵活预测密度组合AI 解读 ↓
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A flexible predictive density combination is introduced for large financial data sets which allows for model set incompleteness. Dimension reduction procedures that include learning allocate the large sets of predictive densities and combination weights to relatively small subsets. Given the representation of the probability model in extended nonlinear state-space form, efficient simulation-based Bayesian inference is proposed using parallel dynamic clustering as well as nonlinear filtering, implemented on graphics processing units. The approach is applied to combine predictive densities based on a large number of individual US stock returns of daily observations over a period that includes the Covid-19 crisis period. Evidence on dynamic cluster composition, weight patterns and model set incompleteness gives valuable signals for improved modelling. This enables higher predictive accuracy and better assessment of uncertainty and risk for investment fund management.