# Erwin — Defense Economics

> Military and defense economics: US federal defense spending, cross-country
> military expenditure (SIPRI), NATO burden-sharing, the arms industry and arms
> trade, defense employment, veterans' benefits, and defense-adjacent
> manufacturing profit rates. 325 published series, 806,583 observations,
> 16 categories, built with the Anu Framework.

Sources: SIPRI, NATO, BEA, BLS, FRED, USAspending.gov, US Department of Defense,
World Bank WDI, and Historical Statistics of the United States.

Formats: CSV and Parquet. JSON is not offered as a data format; the series
registry is served as metadata.

## Data
- [Whole dataset (zip, 0 bytes)](https://erwin.heterodata.org/downloads/data.zip): 324 per-series CSV files and 324 Parquet files, plus the data dictionary, the provenance record, the terms of use and the citation file.
- [Data dictionary (CSV)](https://erwin.heterodata.org/downloads/data_dictionary.csv): one row per published series — name, category, units, frequency, coverage, source.
- [Provenance record (CSV)](https://erwin.heterodata.org/downloads/PROVENANCE.csv): per series, who published it, how it was constructed, and what shape the file is.
- [Bundle manifest (CSV)](https://erwin.heterodata.org/downloads/BUNDLE_MANIFEST.csv): every bundle member's byte count and SHA-256, and the bundle's own TOTAL.
- [Terms of use](https://erwin.heterodata.org/downloads/TERMS.md) and [citation](https://erwin.heterodata.org/downloads/CITATION.cff).
- Per-series files follow `/downloads/series/<id>.csv` and `/downloads/series/<id>.parquet`, e.g. [D028 as CSV](https://erwin.heterodata.org/downloads/series/D028.csv).

## Metadata
- [Series registry (JSON)](https://erwin.heterodata.org/metadata/series_registry.json): provenance, construction and triage per series. Metadata, not a data offering.
- [Web manifest (JSON)](https://erwin.heterodata.org/metadata/WEB_MANIFEST.json): the counts every page renders, so they can be checked.

## Pages
- [Explore](https://erwin.heterodata.org/explore): chart any of the 324 chartable series (318 as lines over time, 6 as ranked bar charts).
- [Data](https://erwin.heterodata.org/data): every series with its own CSV and Parquet links, and the bulk bundle.
- [Methodology](https://erwin.heterodata.org/methodology): construction, units, limits, and what is withheld and why.
- [Code](https://erwin.heterodata.org/code) · [About](https://erwin.heterodata.org/about)

Site: https://erwin.heterodata.org
