Search Results for author: Sokbae Lee

Found 18 papers, 7 papers with code

Treatment Choice, Mean Square Regret and Partial Identification

no code implementations10 Oct 2023 Toru Kitagawa, Sokbae Lee, Chen Qiu

We consider a decision maker who faces a binary treatment choice when their welfare is only partially identified from data.

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

A Robust Method for Microforecasting and Estimation of Random Effects

no code implementations3 Aug 2023 Raffaella Giacomini, Sokbae Lee, Silvia Sarpietro

We propose a method for forecasting individual outcomes and estimating random effects in linear panel data models and value-added models when the panel has a short time dimension.

Time Series

Prediction Risk and Estimation Risk of the Ridgeless Least Squares Estimator under General Assumptions on Regression Errors

no code implementations22 May 2023 Sungyoon Lee, Sokbae Lee

In recent years, there has been a significant growth in research focusing on minimum $\ell_2$ norm (ridgeless) interpolation least squares estimators.

regression

Implicit Bias against a Capitalistic Society Predicts Market Earnings

no code implementations2 Apr 2023 Syngjoo Choi, Kyu Sup Hahn, Byung-Yeon Kim, Eungik Lee, Jungmin Lee, Sokbae Lee

This paper investigates whether ideological indoctrination by living in a communist regime relates to low economic performance in a market economy.

Fast Inference for Quantile Regression with Tens of Millions of Observations

no code implementations29 Sep 2022 Sokbae Lee, Yuan Liao, Myung Hwan Seo, Youngki Shin

Big data analytics has opened new avenues in economic research, but the challenge of analyzing datasets with tens of millions of observations is substantial.

regression Time Series +1

Average Adjusted Association: Efficient Estimation with High Dimensional Confounders

1 code implementation27 May 2022 Sung Jae Jun, Sokbae Lee

The log odds ratio is a well-established metric for evaluating the association between binary outcome and exposure variables.

Vocal Bursts Intensity Prediction

Treatment Choice with Nonlinear Regret

no code implementations17 May 2022 Toru Kitagawa, Sokbae Lee, Chen Qiu

The literature focuses on the mean of welfare regret, which can lead to undesirable treatment choice due to sensitivity to sampling uncertainty.

regression

Bounding Treatment Effects by Pooling Limited Information across Observations

1 code implementation9 Nov 2021 Sokbae Lee, Martin Weidner

Our bounds are designed to be robust in challenging situations, for example, when the conditioning variables take on a large number of different values in the observed sample, or when the overlap condition is violated.

valid

Why North Korean Refugees are Reluctant to Compete: The Roles of Cognitive Ability

no code implementations18 Aug 2021 Syngjoo Choi, Byung-Yeon Kim, Jungmin Lee, Sokbae Lee

The study compares the competitiveness of three Korean groups raised in different institutional environments: South Korea, North Korea, and China.

Fast and Robust Online Inference with Stochastic Gradient Descent via Random Scaling

1 code implementation6 Jun 2021 Sokbae Lee, Yuan Liao, Myung Hwan Seo, Youngki Shin

We develop a new method of online inference for a vector of parameters estimated by the Polyak-Ruppert averaging procedure of stochastic gradient descent (SGD) algorithms.

Econometrics Time Series +1

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

Least Squares Estimation Using Sketched Data with Heteroskedastic Errors

1 code implementation15 Jul 2020 Sokbae Lee, Serena Ng

The result arises because the sketched estimates in the case of random projections can be expressed as degenerate $U$-statistics, and under certain conditions, these statistics are asymptotically normal with homoskedastic variance.

regression

Identifying the Effect of Persuasion

1 code implementation6 Dec 2018 Sung Jae Jun, Sokbae Lee

This paper examines a commonly used measure of persuasion whose precise interpretation has been obscure in the literature.

Causal Inference

High Dimensional Classification through $\ell_0$-Penalized Empirical Risk Minimization

1 code implementation23 Nov 2018 Le-Yu Chen, Sokbae Lee

We consider a high dimensional binary classification problem and construct a classification procedure by minimizing the empirical misclassification risk with a penalty on the number of selected features.

Binary Classification Classification +2

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