Independent variable | Value |
Age | Numerical variable ranging from 20 to 82 |
Gender | 1 if male; 0 if female |
Employment | 1 if full-time; 0 otherwise |
Income | Categorical variable representing income, in million yen per year (categories: 2<, 2 - 3.99, 4 - 5.99, 6 - 7.99, 8 - 9.99, 10 - 11.99, 12 - 14.99, 15 - 19.99, 20≤) |
Altruistic orientation | Numerical variable ranging from 10 to 50 |