arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.03540math.STstat.OTstat.TH
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对称设计下高维单指标模型的推断

Inference In High-dimensional Single-Index Models Under Symmetric Designs

Hamid Eftekhari, Moulinath Banerjee, Ya'acov Ritov

摘要:

研究了高维单指标模型中回归系数的统计推断问题。在椭圆对称条件下,单指数模型可以转化为回归参数可识别的代理线性模型。我们构造了感兴趣的回归系数的估计,这些估计类似于标准线性模型中的去偏套索估计,并表现出类似的性质:根-n-一致性和渐近正态性。该过程完全绕过了对未知链接函数的估计,根据问题的底层结构,这可能是非常具有挑战性的。此外,在高斯性下,我们通过在Hermite多项式基上扩展连接函数,提出了系数的更有效的有效估计。最后,我们通过精心设计的模拟实验来说明我们的方法。

英文摘要:

The problem of statistical inference for regression coefficients in a high-dimensional single-index model is considered. Under elliptical symmetry, the single index model can be reformulated as a proxy linear model whose regression parameter is identifiable. We construct estimates of the regression coefficients of interest that are similar to the debiased lasso estimates in the standard linear model and exhibit similar properties: root-n-consistency and asymptotic normality. The procedure completely bypasses the estimation of the unknown link function, which can be extremely challenging depending on the underlying structure of the problem. Furthermore, under Gaussianity, we propose more efficient estimates of the coefficients by expanding the link function in the Hermite polynomial basis. Finally, we illustrate our approach via carefully designed simulation experiments.

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。

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