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The index of gerosity is the residual of regressing national average of response to the question gHave you donated money to a charity in the past month?h on GDP per capita.
Period:
Area:
10 countries/ areas
Highlight:
1 United Kingdom23.3%
2 Australia15.9%
3 United States9.8%
4 Canada8.9%
5 Sweden8.6%
6 Germany1.1%
7 Republic of Korea-8.3%
8 Italy-8.4%
9 France-14.7%
10 Japan -25.8%

Source
Helliwell, John F., Richard Layard, Jeffrey Sachs, and Jan-Emmanuel De Neve, eds. 2021. World Happiness Report 2021. New York: Sustainable Development Solutions Network.

Correlations with major national performance indices
Life satisfaction (10 steps)
No. of data10
Regression equation
Y = 2.418549 X +6.740
Correlation coefficient (r)0.763
Coefficient of determination (R2)0.582

GDP per capita (current US$)
No. of data10
Regression equation
Y = 50847.605914 X +49204.485
Correlation coefficient (r)0.653
Coefficient of determination (R2)0.426

Life expectancy at birth - Both sexes (years)
No. of data10
Regression equation
Y = -6.616439 X +81.959
Correlation coefficient (r)-0.508
Coefficient of determination (R2)0.258

Fertility rate, total (births per woman)
No. of data10
Regression equation
Y = 0.578424 X +1.456
Correlation coefficient (r)0.316
Coefficient of determination (R2)0.100

Suicide - all ages (per 100,000 population)
No. of data10
Regression equation
Y = -12.204228 X +14.097
Correlation coefficient (r)-0.309
Coefficient of determination (R2)0.095