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• W4380591198 abstract "Abstract Expected shortfall (ES), also known as superquantile or conditional value-at-risk, is an important measure in risk analysis and stochastic optimisation and has applications beyond these fields. In finance, it refers to the conditional expected return of an asset given that the return is below some quantile of its distribution. In this paper, we consider a joint regression framework recently proposed to model the quantile and ES of a response variable simultaneously, given a set of covariates. The current state-of-the-art approach to this problem involves minimising a non-differentiable and non-convex joint loss function, which poses numerical challenges and limits its applicability to large-scale data. Motivated by the idea of using Neyman-orthogonal scores to reduce sensitivity to nuisance parameters, we propose a statistically robust and computationally efficient two-step procedure for fitting joint quantile and ES regression models that can handle highly skewed and heavy-tailed data. We establish explicit non-asymptotic bounds on estimation and Gaussian approximation errors that lay the foundation for statistical inference, even with increasing covariate dimensions. Finally, through numerical experiments and two data applications, we demonstrate that our approach well balances robustness, statistical, and numerical efficiencies for expected shortfall regression." @default.
• W4380591198 created "2023-06-15" @default.
• W4380591198 creator A5027740199 @default.
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• W4380591198 date "2023-06-15" @default.
• W4380591198 modified "2023-09-23" @default.
• W4380591198 title "Robust estimation and inference for expected shortfall regression with many regressors" @default.
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• W4380591198 doi "https://doi.org/10.1093/jrsssb/qkad063" @default.
• W4380591198 hasPublicationYear "2023" @default.
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