Catalog / Groningen Growth and Development Centre (GGDC), University of Groningen - Maddison Project Database

ggdc

Groningen Growth and Development Centre (GGDC), University of Groningen - Maddison Project Database

Open · redistributedCreative Commons Attribution 4.0 (CC BY 4.0)Long-Run & Historical

Redistributable. This source is served as canonical Parquet under the license below, with attribution and provenance preserved.

Coverage

Series catalogued

14,998

Temporal coverage

through 2023-12-31

Licensing & provenance

License: Creative Commons Attribution 4.0 (CC BY 4.0)
License URL: https://creativecommons.org/licenses/by/4.0/
Required attribution: Maddison Project Database, Groningen Growth and Development Centre (J. Bolt and J.L. van Zanden)
Redistribution: Permitted (served here)
Commercial use: Yes
Modification: Permitted
Provider homepage: https://www.rug.nl/ggdc/historicaldevelopment/maddison/
Provider terms: https://www.rug.nl/ggdc/historicaldevelopment/maddison/releases/maddison-project-database-2023?lang=en

How to cite

Groningen Growth and Development Centre (GGDC), University of Groningen - Maddison Project Database. Retrieved from https://www.rug.nl/ggdc/historicaldevelopment/maddison/. Compiled and redistributed by the Elkassabgi Data Library.

Processing: Retrieved from the official source, normalized to a long {series_key, obs_date, value} schema (period-start dates), de-duplicated, and stored as zstd Parquet. Compiled and redistributed by the Elkassabgi Data Library.

Access & mirrors

Download: Select & download ggdc series as CSV →
API: Get a free API key, then GET /v1/series/<id>.csv
Canonical landing: https://econdatalibrary.com/ggdc
Update cadence: irregular
Automated refresh: live — this database is on the daily update run
Update strategy: overwrite if changed
Storage layout: multi-file under data/clean_full/ggdc/: pwt10.parquet, pwt11.parquet, maddison2020.parquet, maddison2023.parquet (all zstd). Schema: series_key prefixed by version ('PWT10:{var}:{ccode}', 'PWT11:...', 'MADDISON:...', 'MADDISON23:...'), obs_date(date32, Dec-31), value(float64). save() does one pq.write_table each (non-atomic).

Full description

GGDC (Groningen Growth and Development Centre) data ingest. Sources: Penn World Tables 10.0: URL: https://www.rug.nl/ggdc/docs/pwt100.xlsx 183 countries, 1950-2019, 48 macro/productivity variables Ref: Feenstra, Inklaar & Timmer (2015), AER Maddison Project Database 2020: URL: https://www.rug.nl/ggdc/historicaldevelopment/maddison/data/mpd2020.xlsx 169 countries, 1 AD–2018, GDP pc and population (2011 int'l $) Ref: Maddison Project Database 2020, Bolt & van Zanden (2020) Output: data/clean_full/ggdc/pwt10.parquet data/clean_full/ggdc/maddison2020.parquet Series key format: PWT10:{variable}:{countrycode} e.g. PWT10:rgdpe:USA MADDISON:{variable}:{countrycode} e.g. MADDISON:gdppc:CHN Run: python jobs/ingest_ggdc.py

Structured metadata

schema.org/Dataset (Google Dataset Search)

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Croissant (ML-ready, schema.org JSON-LD)

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    "dct": "http://purl.org/dc/terms/"
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  "url": "https://econdatalibrary.com/ggdc",
  "creator": {
    "@type": "sc:Organization",
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  "distribution": [
    {
      "@type": "cr:FileObject",
      "@id": "ggdc-csv",
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      "encodingFormat": "text/csv"
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Part of the Econ Data Library catalog · metadata generated 2026-08-02 from the central registry · browse all datasets