| Variable names and interpretation | |
| Variable names | Variable interpretation |
| income | The level of personal income is a comprehensive variable |
| qb1 | how many brothers and sisters are there in total |
| qb2 | how many brothers and sisters living together |
| eduy | the qb1 of years of education |
| qp3 | Personal health status, the higher the score, the worse the body |
| feduy | father’s years of education |
| meduy | mother’s years of education |
| qa1age | personal qa1age |
| Gender | dummy variable, male value 1 |
| Urban | dummy variables for, city value 1 |