Working Papers

  • Decomposition of Spillover Effects Under Misspecification: Pseudo-true Estimands and a Local–Global Extension
    Yechan Park and Xiaodong Yang, 2026.
    arXiv preprint.
    Link

  • A Bracketing Relationship for Long-Term Policy Evaluation with Combined Experimental and Observational Data
    Yechan Park and Yuya Sasaki, 2024.
    Under Review.
    Link

  • Matching ≤ Hybrid ≤ Difference in Differences
    Yechan Park and Yuya Sasaki, 2024.
    Link

Published Papers

  • The Informativeness of Combined Experimental and Observational Data under Dynamic Selection
    Yechan Park and Yuya Sasaki, 2026.
    Journal of Econometrics.
    Link

  • Asymptotic Expansion for Batched Bandits
    Yechan Park and Nakahiro Yoshida, 2024.
    Statistical Inference for Stochastic Processes (Accepted).
    Link

  • Beyond Central Limit Theorem for Higher Order Inference in Batched Bandits
    Yechan Park, Nakahiro Yoshida, and Ruohan Zhan, 2022.
    Neural Information Processing Systems 2022, Causal Machine Learning for Real-World Impact Workshop.
    Link

Work in Progress

  • Weighing Experimental vs. Observational Evidence: Decision-Relevant Summaries of Treatment Effect Heterogeneity

    Isaiah Andrews, Raj Chetty, Yechan Park, and Bas Sanders.