{
  "paper": {
    "rank": 5,
    "paper_id": "aeraej-84",
    "title": "Green Infrastructure: The Effects of Urban Rail Transit on Air Quality",
    "authors": "Yihsu Chen; Alexander Whalley",
    "year": 2012,
    "journal": "American Economic Journal: Economic Policy",
    "doi": "10.1257/pol.4.1.58",
    "package_bytes": 118569665,
    "source_specification": "Table 3",
    "selection_stratum": "rdd_binary"
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    "assessment_status": "unsupported_design",
    "unsupported": "The transit-opening specification uses a time discontinuity with cubic trends and weather/hour controls. The binary opening indicator alone does not supply the template untreated comparison group."
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  "reason": "The transit-opening specification uses a time discontinuity with cubic trends and weather/hour controls. The binary opening indicator alone does not supply the template untreated comparison group.",
  "reviewed_at": "2026-10-12",
  "eligibility": {
    "category": "not_did",
    "decision": "excluded",
    "reason": "The transit-opening specification uses a time discontinuity with cubic trends and weather/hour controls. The binary opening indicator alone does not supply the template untreated comparison group."
  },
  "source_provenance": [
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    "variable": "opl1",
    "scope": "Observed support in the indicated source frame; missing values excluded. N=17,496; missing=0. Frame: selected_source_data. Source: AEJ-Policy/Chen_Whalley_AEJ-Policy_2012_114778/R/01_replicate_empirical_results.R.",
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    "status": "verified",
    "verification_outcome": "verified",
    "code_readiness": "runs_with_shim",
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    "scope": "Reported by the supplied library; not re-executed in this tranche."
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}