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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 = 2.736511 X +6.749
Correlation coefficient (r)0.780
Coefficient of determination (R2)0.608

GNI per capita, Atlas method (current US$)
No. of data10
Regression equation
Y = 32680.351513 X +45152.124
Correlation coefficient (r)0.485
Coefficient of determination (R2)0.235

Life expectancy at birth - Both sexes (years)
No. of data10
Regression equation
Y = -5.901724 X +82.281
Correlation coefficient (r)-0.565
Coefficient of determination (R2)0.319

Fertility rate, total (births per woman)
No. of data10
Regression equation
Y = 0.751341 X +1.559
Correlation coefficient (r)0.415
Coefficient of determination (R2)0.172

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