Conditional Value-at-Risk: Semiparametric estimation and inference
条件风险价值:半参数估计与推断AI 解读 ↓
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条件风险价值:半参数估计与推断AI 解读 ↓
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Conditional Value-at-Risk (CVaR) plays an important role in financial risk management. Nonparametric CVaR estimation suffers from the “curse of dimensionality” and slow convergence rate. To overcome these issues, we study semiparametric CVaR estimation and inference for parametric model with nonparametric noise distribution. Under a general framework that allows for many widely used time series models, we propose a semiparametric CVaR estimator that achieves the parametric convergence rate. Furthermore, to draw simultaneous inference for CVaR at multiple confidence levels, we establish a functional central limit theorem for CVaR process indexed by the confidence level and use it to study the conditional expected shortfall. A user-friendly bootstrap approach is introduced to facilitate non-expert practitioners to perform confidence interval construction for CVaR. The methodology is illustrated through both Monte Carlo studies and an application to S&P 500 index.