arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2411.00520stat.MEecon.EM
收藏

Growth-at-Risk的校准分位数预测

Calibrated quantile prediction for Growth-at-Risk

Pietro Bogani, Matteo Fontana, Luca Neri, Simone Vantini

AI总结:

针对经济金融领域Growth-at-Risk计算中极端分位数估计不准的问题,提出共形校准分位数估计框架,经模拟与实证验证其在各分位水平均提升校准性与稳健性,还给出可交换性假设下的覆盖率保证性质。

摘要:

准确计算经验分布极端分位数的稳健估计值是经济政策制定、金融行业等众多应用领域的核心任务,这类估计在计算Growth-at-Risk(GaR,风险增长)等风险指标时尤为关键。本文提出一种共形框架来估计校准分位数,并开展了大规模模拟研究与GaR真实场景分析,以验证其相较于现有最优方法的优势。结果显示,CP(共形预测)方法在所有分位水平下均能持续提升分位数估计的校准性与稳健性,其中极端分位数处的校准增益最为显著——该区域是风险评估的核心,也是传统方法普遍表现不足的位置。此外,本文提出了一项新性质,可在可交换性假设下保证覆盖率,为通过量化、控制未来极端观测值的发生概率来管理风险提供了有效工具。

英文摘要:

Accurate computation of robust estimates for extremal quantiles of empirical distributions is an essential task for a wide range of applicative fields, including economic policymaking and the financial industry. Such estimates are particularly critical in calculating risk measures, such as Growth-at-Risk (GaR). % and Value-at-Risk (VaR). This work proposes a conformal framework to estimate calibrated quantiles, and presents an extensive simulation study and a real-world analysis of GaR to examine its benefits with respect to the state of the art. Our findings show that CP methods consistently improve the calibration and robustness of quantile estimates at all levels. The calibration gains are appreciated especially at extremal quantiles, which are critical for risk assessment and where traditional methods tend to fall short. In addition, we introduce a novel property that guarantees coverage under the exchangeability assumption, providing a valuable tool for managing risks by quantifying and controlling the likelihood of future extreme observations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑