Data Sources
Every value in Indexle is drawn from a named, publicly accessible source. This page records all of them. When a new data field is added to the game, it is added here.
World Bank — World Development Indicators (WDI)
The primary source for all six radar indicators. The WDI is the World Bank's premier compilation of cross-country comparable statistics on global development.
Fields: GDP per capita PPP (NY.GDP.PCAP.PP.CD) · Life expectancy (SP.DYN.LE00.IN) · Population 65+ % (SP.POP.65UP.TO.ZS) · Total fertility rate (SP.DYN.TFRT.IN) · Population density (EN.POP.DNST) · Internet users % (IT.NET.USER.ZS) · Arable land % (AG.LND.ARBL.ZS) · Military expenditure % GDP (MS.MIL.XPND.GD.ZS)
Wikidata
Used for country metadata not available in WDI. Wikidata is the free, collaborative knowledge base maintained by the Wikimedia Foundation.
Fields: ISO-2 and ISO-3 codes · Country names · Capital city · Currency · Official languages · Driving side · Coordinates · Population · Land area
Pew Research Center — Religious Composition by Country
Source for the majority religion categorical field. Pew's Global Religious Futures project models religious demographic change using census data, surveys, and vital statistics.
Fields: Majority religion (Christian · Muslim · Hindu · Buddhist · Jewish · Unaffiliated · Other)
V-Dem Institute — Varieties of Democracy
Informs the government type categorical field. V-Dem provides the most granular cross-national data on democracy and regime type, published annually by the University of Gothenburg.
Fields: Government type (Republic · Parliamentary Monarchy · Absolute Monarchy · One-Party State · Theocracy · Military Rule)
Köppen–Geiger Climate Classification
The climate field uses the standard Köppen–Geiger system, collapsed to five primary zones. Assignment is population-weighted so that large countries with mixed climates reflect where their population actually lives.
Fields: Climate (Tropical · Arid · Temperate · Continental · Polar)
UN Statistics Division — Standard Country Codes (M49)
Reference for geographic region assignments. The UN M49 standard defines subregions and intermediate regions for all countries and territories.
Fields: Region (North America · Latin America · Europe · Middle East · North Africa · Sub-Saharan Africa · East Asia · Southeast Asia · South Asia · Central Asia · Oceania)