Welcome!

My name is Joonho (Phil) Hwang (황준호; 黃俊晧), and I am a fourth-year PhD student in economics at Seoul National University, where I am fortunate to be advised by Professor Seojeong Lee. My research interests are in econometrics, with a particular focus on panel data and causal inference. Click here for a copy of my CV. My email is jhhwang24@snu.ac.kr.

Working papers

Online Updating for Linear Panel Regressions
joint with Seojeong Lee
[Coming Soon!]

abstract

In this paper, we develop online updating methods for linear panel regression models. Online updating refers to procedures for sequentially updating parameter estimates as new data become available. In practice, the potential size of the dataset or data confidentiality constraints may preclude researchers from storing or accessing the entire dataset. We propose an online updating procedure for widely used linear regression models in panel data, where data expansion can occur through either (1) the arrival of new units or (2) the arrival of additional time periods for existing units. The proposed procedure yields closed-form expressions for updating both the point estimates and associated standard errors in each scenario.

What is online updating? See the example below:

presented at: SNU Econometrics Workshop, SETA 2025, University of Sydney, KER International Conference 2025, SNU Workshop on Recent Advances in Econometrics

Work in progress

Revisiting the Weighting Scheme in Synthetic Difference-in-Differences
joint with Chencheng Fang

Last updated: September 30, 2025