Datasets

Cleaned, geocoded, linked, and citable. Most are pre-release; once a companion paper goes up, the dataset goes to Zenodo with a DOI.

• 2026 · in-progress · CC-BY-4.0 · ~2° global grid, ~30 GB compressed · geospatial, trade, networks, effective-distance

  EffDist V2026

  Elizaveta Gonchar, Ian Helfrich. Global gridded effective-distance dataset built on WorldPop population grids and GHS-SMOD settlement layers. Uses Brockmann-Helbing-style effective distance through a probability-weighted flow graph instead of geographic great-circle distance.
• 2026 · in-progress · CC-BY-4.0 (project data); CDFI Fund source data is U.S. public domain · nmtc, blended-finance, panel-data

  U.S. New Markets Tax Credit project-level panel (FY2001-FY2022)

  Ian Helfrich. Cleaned, geocoded, and CDE-linked project-level panel covering every Qualified Equity Investment in the U.S. New Markets Tax Credit program over its first 22 fiscal years. The data spine behind Helfrich (2026).

  Source code · Viewer