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The happiness score comes from a representative survey conducted by the Gallup of each of 155 countries where a typical survey size is 1000 people per country per year.
This score is known as the Cantril ladder. The survey urges respondents to assess their own current lives on that 0 to 10 scale happiness scale with 0 being the worst possible and 10 being the individual's best concievable life.
Other metrics in the report are estimates of the extent to which particular factors such as levels of GDP per capita, life expectancy, freedom, and perceived government corruption, contribute to higher life evaluations in each country. These estimates come from the World Happiness Report.
The code for this project can be found at: https://github.com/scottcm73/world_happiness
An initial version of a world chloropleth map was created by d3.org. Subsequent versions of the chloropleth maps were based on this map. Data for the project was taken from the World Happiness Report up to 2020 at Kaggle.com.
Aché, M. World Happiness Report up to 2020 Bliss scored agreeing to financial, social, etc. Kaggle.com. Retrieved from: https://www.kaggle.com/mathurinache/world-happiness-report
Continuous Legend. bl.ocks.org. Retrieved from http://bl.ocks.org/syntagmatic/e8ccca52559796be775553b467593a9f
Helliwell, John F., Richard Layard, Jeffrey Sachs, and Jan-Emmanuel De Neve, eds. 2020. World Happiness Report 2020. New York: Sustainable Development Solutions Network. Retrieved from https://happiness-report.s3.amazonaws.com/2020/WHR20.pdf
Most basic choropleth map in d3.js. d3.org. Retrieved from: https://www.d3-graph-gallery.com/graph/choropleth_basic.html