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arXiv 2107.02602math.STecon.EMstat.MEstat.TH
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低秩模型的推断

Inference for Low-Rank Models

Victor Chernozhukov, Christian Hansen, Yuan Liao, Yinchu Zhu

摘要:

本文研究了具有高维参数矩阵的线性模型中的推断问题,该参数矩阵可以很好地近似于一个“尖峰低秩矩阵”。一个尖峰低秩矩阵的秩与它的维数和发散到无穷大的非零奇异值相比增长缓慢。我们发现,这个框架涵盖了广泛的一类模型的潜在变量,可以容纳矩阵完成问题,因子模型,变系数模型,和异质性的治疗效果。对于推理,我们应用一个程序,依赖于一个初始的核范数惩罚的估计步骤,其次是两个普通的最小二乘回归。我们考虑的框架,估计不相干的特征向量,并使用旋转参数,认为特征空间估计是渐近无偏的。使用这个框架,我们表明,我们的程序提供了渐近正常的推断,并实现了半参数的效率界。我们说明了我们的框架,提供低级别的条件,其应用程序中的治疗效果的背景下,治疗分配可能是强烈依赖。

英文摘要:

This paper studies inference in linear models with a high-dimensional parameter matrix that can be well-approximated by a ``spiked low-rank matrix.'' A spiked low-rank matrix has rank that grows slowly compared to its dimensions and nonzero singular values that diverge to infinity. We show that this framework covers a broad class of models of latent-variables which can accommodate matrix completion problems, factor models, varying coefficient models, and heterogeneous treatment effects. For inference, we apply a procedure that relies on an initial nuclear-norm penalized estimation step followed by two ordinary least squares regressions. We consider the framework of estimating incoherent eigenvectors and use a rotation argument to argue that the eigenspace estimation is asymptotically unbiased. Using this framework we show that our procedure provides asymptotically normal inference and achieves the semiparametric efficiency bound. We illustrate our framework by providing low-level conditions for its application in a treatment effects context where treatment assignment might be strongly dependent.

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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