Search Results for author: Xiaohong Chen

Found 14 papers, 1 papers with code

A Mean-Field Analysis of Neural Gradient Descent-Ascent: Applications to Functional Conditional Moment Equations

no code implementations18 Apr 2024 Yuchen Zhu, Yufeng Zhang, Zhaoran Wang, Zhuoran Yang, Xiaohong Chen

Under this regime, gradient descent-ascent corresponds to a Wasserstein gradient flow over the space of probability measures defined over the space of neural network parameters.

SGMM: Stochastic Approximation to Generalized Method of Moments

no code implementations25 Aug 2023 Xiaohong Chen, Sokbae Lee, Yuan Liao, Myung Hwan Seo, Youngki Shin, Myunghyun Song

We introduce a new class of algorithms, Stochastic Generalized Method of Moments (SGMM), for estimation and inference on (overidentified) moment restriction models.

Computational Efficiency

STEEL: Singularity-aware Reinforcement Learning

no code implementations30 Jan 2023 Xiaohong Chen, Zhengling Qi, Runzhe Wan

Batch reinforcement learning (RL) aims at leveraging pre-collected data to find an optimal policy that maximizes the expected total rewards in a dynamic environment.

Off-policy evaluation reinforcement-learning

Inference on Time Series Nonparametric Conditional Moment Restrictions Using General Sieves

no code implementations31 Dec 2022 Xiaohong Chen, Yuan Liao, Weichen Wang

This paper considers general nonlinear sieve quasi-likelihood ratio (GN-QLR) based inference on expectation functionals of time series data, where the functionals of interest are based on some nonparametric function that satisfy conditional moment restrictions and are learned using multilayer neural networks.

Off-policy evaluation Time Series +1

Adaptive incomplete multi-view learning via tensor graph completion

no code implementations7 Aug 2022 Heng Zhang, Xiaohong Chen

With the advancement of the data acquisition techniques, multi-view learning has become a hot topic.

MULTI-VIEW LEARNING

On Well-posedness and Minimax Optimal Rates of Nonparametric Q-function Estimation in Off-policy Evaluation

no code implementations17 Jan 2022 Xiaohong Chen, Zhengling Qi

We study the off-policy evaluation (OPE) problem in an infinite-horizon Markov decision process with continuous states and actions.

Off-policy evaluation

Efficient Estimation in NPIV Models: A Comparison of Various Neural Networks-Based Estimators

1 code implementation13 Oct 2021 Jiafeng Chen, Xiaohong Chen, Elie Tamer

We investigate the performance of various ANNs in nonparametric instrumental variables (NPIV) models of moderately high dimensional covariates that are relevant to empirical economics.

Adaptive Estimation and Uniform Confidence Bands for Nonparametric Structural Functions and Elasticities

no code implementations25 Jul 2021 Xiaohong Chen, Timothy Christensen, Sid Kankanala

The first is a data-driven choice of sieve dimension for a popular class of sieve two-stage least squares estimators.

Simple Adaptive Estimation of Quadratic Functionals in Nonparametric IV Models

no code implementations28 Jan 2021 Christoph Breunig, Xiaohong Chen

This paper considers adaptive, minimax estimation of a quadratic functional in a nonparametric instrumental variables (NPIV) model, which is an important problem in optimal estimation of a nonlinear functional of an ill-posed inverse regression with an unknown operator.

Causal Inference of General Treatment Effects using Neural Networks with A Diverging Number of Confounders

no code implementations15 Sep 2020 Xiaohong Chen, Ying Liu, Shujie Ma, Zheng Zhang

This paper considers a generalized optimization framework for efficient estimation of general treatment effects using artificial neural networks (ANNs) to approximate the unknown nuisance function of growing-dimensional confounders.

Causal Inference

Inference for parameters identified by conditional moment restrictions using a generalized Bierens maximum statistic

no code implementations25 Aug 2020 Xiaohong Chen, Sokbae Lee, Myung Hwan Seo, Myunghyun Song

Many economic panel and dynamic models, such as rational behavior and Euler equations, imply that the parameters of interest are identified by conditional moment restrictions with high dimensional conditioning instruments.

Model Selection

Adaptive, Rate-Optimal Hypothesis Testing in Nonparametric IV Models

no code implementations17 Jun 2020 Christoph Breunig, Xiaohong Chen

We propose a new adaptive hypothesis test for inequality (e. g., monotonicity, convexity) and equality (e. g., parametric, semiparametric) restrictions on a structural function in a nonparametric instrumental variables (NPIV) model.

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