Original collectionUnder development

Under development — library extension. This report is part of the expanded-library work, not the original collection. Source preparation, methods and results are subject to revision.

Provisional eligibility assessment — under development. Deep DiD follow-up: Table 8 directly estimates opening x Taipei against Kaohsiung, with authored 30-day windows, trends/weather in controlled columns and week clustering. This is separate from the main time-discontinuity specifications. Only two cities: generic many-unit clustered inference is not a faithful replacement. This working assessment is not fully vetted and may change. See the report below for its recorded replication or assessment status. Provisional eligibility log

Green Infrastructure: The Effects of Urban Rail Transit on Air Quality

Yihsu Chen; Alexander Whalley (2012). American Economic Journal: Economic Policy.

Under development — community extension. This is a provisional source-design assessment, not a new successful replication or a final eligibility ruling.

Extension index · Provisional eligibility log · Assessment JSON · QMD · Reproduction code

Source design and template applicability

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.

No DiD estimates, uncertainty intervals or homogeneity-test decision were computed in this tranche. No point is added to the calibration plots. This is not a zero effect or a failed statistical test.

Recorded treatment-column measurement

2 distinct nonmissing values in opl1.

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.

These are the existing data-measured counts, not counts inferred from design labels. A binary instrument, group indicator or interaction component need not be the treatment of interest; the source-design assessment above takes precedence for template applicability.

Replication status

This tranche: unsupported design; source code/documentation inspected, no estimator run.

Supplied library: verified; verification: verified; preparation: runs_with_shim. These are the library’s labels, not new verification claims. Missing data and unsupported designs are separate issues.

Evidence and provenance

The following files in the supplied library were inspected. Their SHA-256 digests are recorded in the downloadable assessment JSON. Source archives and microdata are not redistributed.

• AEJ-Policy/Chen_Whalley_AEJ-Policy_2012_114778/R/01_replicate_empirical_results.R (307 lines)
• AEJ-Policy/Chen_Whalley_AEJ-Policy_2012_114778/aeraej-84.md (210 lines)