Transformer-based CoVaR: Systemic Risk in Textual Information
基于 Transformer 的 CoVaR:文本信息中的系统性风险AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确以条件损失分位数 CoVaR 衡量和预测系统性金融风险,因此最直接对应尾部与系统性风险。
基于 Transformer 的 CoVaR:文本信息中的系统性风险AI 解读 ↓
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Conditional Value-at-Risk (CoVaR) quantifies systemic financial risk by measuring the loss quantile of one asset, conditional on another asset experiencing distress. We develop a Transformer-based methodology that integrates financial news articles directly with market data to improve CoVaR estimates. Unlike approaches that use predefined sentiment scores, our method incorporates raw text embeddings generated by a large language model (LLM). We prove explicit error bounds for our Transformer CoVaR estimator, showing that accurate CoVaR learning is possible even with small datasets. Using U.S. market returns and Reuters news items from 2006--2013, our out-of-sample results show that textual information impacts the CoVaR forecasts. With better predictive performance, we identify a pronounced negative dip during market stress periods across several equity assets when comparing the Transformer-based CoVaR to both the CoVaR without text and the CoVaR using traditional sentiment measures. Our results show that textual data can be used to effectively model systemic risk without requiring prohibitively large data sets.
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