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arXiv 2008.13174math.STstat.TH
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亚高斯误差下的贝叶斯高维半参数推断

Bayesian High-dimensional Semi-parametric Inference beyond sub-Gaussian Errors

Kyoungjae Lee, Minwoo Chae, Lizhen Lin

摘要:

在高维情形下,考虑了具有未知对称误差的稀疏线性回归模型。假设真实误差分布属于局部$β$ -Hölder类,尾部呈指数下降,不需要是亚高斯分布。我们得到的回归系数和误差密度的后验收敛速度,这是近最优的和自适应的未知稀疏水平。此外,我们推导了半参数Bernstein-von Mises(BvM)定理来描述回归系数的边缘后验的渐近形状。在真得分函数为亚高斯分布的假设下,得到了回归系数的强模型选择相合性,从而证明了频率论可信集的有效性.

英文摘要:

We consider a sparse linear regression model with unknown symmetric error under the high-dimensional setting. The true error distribution is assumed to belong to the locally $β$-Hölder class with an exponentially decreasing tail, which does not need to be sub-Gaussian. We obtain posterior convergence rates of the regression coefficient and the error density, which are nearly optimal and adaptive to the unknown sparsity level. Furthermore, we derive the semi-parametric Bernstein-von Mises (BvM) theorem to characterize asymptotic shape of the marginal posterior for regression coefficients. Under the sub-Gaussianity assumption on the true score function, strong model selection consistency for regression coefficients are also obtained, which eventually asserts the frequentist's validity of credible sets.

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