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docs: adds source details for population.json in SOURCES.md #604

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16 changes: 16 additions & 0 deletions SOURCES.md
Original file line number Diff line number Diff line change
Expand Up @@ -228,6 +228,22 @@ Assets from the video game [Celeste](http://www.celestegame.com/).
## `political-contributions.json`

## `population.json`
United States population statistics by sex and age group across decades between 1850 and 2000. The dataset was obtained from [IPUMS USA](https://usa.ipums.org/usa/), which "collects, preserves and harmonizes U.S. census microdata" from as early as 1790.

### Data Structure
The dataset is structured as follows:
- year: four-digit year of the survey. - [IPUMS description](https://usa.ipums.org/usa-action/variables/YEAR#description_section)
- age: age group in 5-year intervals (0 represents ages 0-4, 5 represents 5-9, 10 represents 10-14, etc., up to 90 representing 90 and above) - [IPUMS description](https://usa.ipums.org/usa-action/variables/AGE#description_section)
- sex: Sex (men = 1 / women = 2) - [IPUMS description](https://usa.ipums.org/usa-action/variables/SEX#description_section)
- people: Number of individuals, equivalent to IPUMS variable name [PERWT](https://usa.ipums.org/usa-action/variables/PERWT#description_section).

### Notes on Data Origin
IPUMS updates and revises datasets over time, which may result in discrepancies between this dataset and current IPUMS data. Details on data revisions are available [here](https://usa.ipums.org/usa-action/revisions).

### Terms of Use and Citation
When using this dataset, please refer to IPUMS USA [terms of use](https://usa.ipums.org/usa/terms.shtml). The organization requests the use of the following citation for this json file:

Steven Ruggles, Katie Genadek, Ronald Goeken, Josiah Grover, and Matthew Sobek. Integrated Public Use Microdata Series: Version 6.0. Minneapolis: University of Minnesota, 2015. http://doi.org/10.18128/D010.V6.0

## `seattle-weather.csv`

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