Maddison

Name: Maddison
Creator: Maddison

Metadata onlyLicense under review

Maddison Project Database 2023 — historical GDP per capita, ~180 countries, 1 AD–2022. License: CC BY 4.0 Source: https://www.rug.nl/ggdc/historicaldevelopment/maddison/ No API key required (direct XLSX download). Variables: gdppc (real GDP per capita, 2011 USD PPP), pop (population, thousands),…

Metadata only. This source’s license does not permit redistribution, so we catalog its metadata but do not re-serve the data. Use the provider link to obtain it under the original terms.

Coverage

Series catalogued

338

Temporal coverage

? – 2018-12-31

Licensing & provenance

License: License under review
Redistribution: Not permitted (metadata only)
Commercial use: Restricted / no
Modification: Permitted

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 maddison series as CSV →
API: Get a free API key, then GET /v1/series/<id>.csv
Canonical landing: https://econdatalibrary.com/maddison.html
Update cadence: irregular
Update strategy: bulk snapshot if changed
Storage layout: single parquet data/clean_full/maddison/maddison.parquet (~208KB; schema series_key:string {variable}:{ISO3}, obs_date:date32 (Dec-31), value:float64, zstd). Skip-if-exists guard at lines 40-42; one XLSX download (first working URL) then one write (lines 133-138).

Full description

Structured metadata

schema.org/Dataset (Google Dataset Search)

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  "url": "https://econdatalibrary.com/maddison.html",
  "identifier": "maddison",
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  "publisher": {
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  },
  "creator": {
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  },
  "keywords": [
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  "citation": "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.",
  "sameAs": [
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    "https://zenodo.org/communities/econdatalibrary"
  ],
  "usageInfo": "Metadata-only catalog entry. This source's license does not permit redistribution, so the data itself is not served here; use the provider link to obtain the data under its terms."
}

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

{
  "@context": {
    "@language": "en",
    "@vocab": "https://schema.org/",
    "cr": "http://mlcommons.org/croissant/",
    "data": {
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      "@type": "@json"
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      "@type": "@vocab"
    },
    "sc": "https://schema.org/",
    "conformsTo": "dct:conformsTo",
    "dct": "http://purl.org/dc/terms/"
  },
  "@type": "sc:Dataset",
  "conformsTo": "http://mlcommons.org/croissant/1.0",
  "name": "maddison",
  "description": "Maddison Project Database 2023 — historical GDP per capita, ~180 countries, 1 AD–2022. License: CC BY 4.0 Source: https://www.rug.nl/ggdc/historicaldevelopment/maddison/ No API key required (direct XLSX download). Variables: gdppc (real GDP per capita, 2011 USD PPP), pop (population, thousands),…",
  "url": "https://econdatalibrary.com/maddison.html",
  "creator": {
    "@type": "sc:Organization",
    "name": "Maddison"
  },
  "publisher": {
    "@type": "sc:Organization",
    "name": "Econ Data Library",
    "url": "https://econdatalibrary.com"
  },
  "citation": "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.",
  "isAccessibleForFree": false,
  "usageInfo": "Metadata-only Croissant record; underlying data is not redistributed under this source's license."
}

Part of the Econ Data Library catalog · metadata generated 2026-07-14 from the central registry · browse all datasets