Blame for DATA_DICTIONARY.md

# Data Dictionary

## Data sources

World Bank Indicators API v2, WDI source ID `2`. Education indicator content may originate from the UNESCO Institute for Statistics. No values are harvested in advance or distributed as official current data inside this ZIP. The app retrieves values in the visitor's browser when requested.

## Supported concepts

| Code | Label | Unit | Interpret carefully |
|---|---|---|---|
| `SE.PRM.CMPT.ZS` | Primary completion rate (gross intake to last primary grade) | Percent of relevant age population | Does not equal a cohort graduation rate, can exceed 100. |
| `SE.SEC.ENRR` | Secondary enrollment, gross | Percent of age-eligible population | Numerator includes students outside official age range; can exceed 100. |
| `SE.TER.ENRR` | Tertiary enrollment, gross | Percent of age-eligible population | Does not measure degrees awarded; can exceed 100. |
| `SE.XPD.TOTL.GD.ZS` | Government expenditure on education, total | % of GDP | Spending level relative to GDP, not outcome or per-pupil spending. |
| `SE.ADT.LITR.ZS` | Adult literacy rate, 15+ | Percent | Survey definitions and reporting intervals may vary. |
| `IT.NET.USER.ZS` | Individuals using the Internet | Percent | Context, not education success. |
| `NY.GDP.PCAP.CD` | GDP per capita, current US dollars | USD | Nominal values reflect FX and price effects. |
| `SP.POP.TOTL` | Population | People | Context series, not school-aged population. |

## Observation schema

- `iso3`: one of the supported 16 ISO-3 country codes.
- `year`: integer from 1990 to 2026.
- `indicator`: original World Bank code.
- `value`: a finite reported numeric value. A reported zero is valid; null is missing and is removed.
- `footnote`: optional WDI footnote, if supplied.
- `status`: optional World Bank observation status.

Data are de-duplicated by `(country, year, indicator)`. Repeated rows retain the first occurrence. Unknown codes, invalid numbers and nulls are not included. All series are filtered to the user-selected time range before analysis.

## Supported economies

Argentina, Bolivia, Brazil, Chile, Colombia, Costa Rica, Dominican Republic, Ecuador, Mexico, Panama, Peru, Paraguay, Uruguay, Guatemala, Honduras, El Salvador.

## Provider links

- https://datahelpdesk.worldbank.org/knowledgebase/articles/889392
- https://databank.worldbank.org/metadataglossary/world-development-indicators/
- https://databank.worldbank.org/metadataglossary/world-development-indicators/series/SE.PRM.CMPT.ZS
- https://databank.worldbank.org/metadataglossary/world-development-indicators/series/SE.SEC.ENRR