Non asymptotic controls on a recursive superquantile approximation
Non asymptotic controls on a recursive superquantile approximation
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递归超分位数近似的非渐近控制
DOI:
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发表时间:
2020
影响因子:
1.1
通讯作者:
S. Gadat
中科院分区:
文献类型:
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作者:
Manon Costa;S. Gadat
In this work, we study a new recursive stochastic algorithm for the joint estimation of quantile and superquantile of an unknown distribution. The novelty of this algorithm is to use the Cesaro averaging of the quantile estimation inside the recursive approximation of the superquantile. We provide some sharp non-asymptotic bounds on the quadratic risk of the superquantile estimator for different step size sequences. We also prove new non-asymptotic $L^p$-controls on the Robbins Monro algorithm for quantile estimation and its averaged version. Finally, we derive a central limit theorem of our joint procedure using the diffusion approximation point of view hidden behind our stochastic algorithm.