{
  "paper": {
    "rank": 17,
    "paper_id": "aeraej-154",
    "title": "Pre-Event Trends in the Panel Event-Study Design",
    "authors": "Simon Freyaldenhoven; Christian Hansen; Jesse M. Shapiro",
    "year": 2019,
    "journal": "American Economic Review",
    "doi": "10.1257/aer.20180609",
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    "selection_stratum": "did_continuous"
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  "reviewed_at": "2026-10-12",
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    "decision": "excluded",
    "reason": "The source x_0 is the change in the number of daily newspapers, not a binary entry event. The turnout equation is a count-exposure panel event-study target; thresholding changes its estimand."
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}