control variables

assignment

gender

1 = male 2 = female

race

1 = Han 2 = ethnic minorities

age

1 = 15 - 24, 2 = 25 - 34, 3 = 35 - 44, 4 = 45 - 54, 5 = 55 - 64,

6 = 65 - 74, 7 = 75 - 84, 8 = 85 - 94, 9 = 95 - 104

political outlook

1 = Chinese Communist Party,

2 = Democratic Party, 3 = Non partisan (common people)

annual income of the family (unit: yuan)

1 = 1000 the following, 2 = 1000 - 2000, 3 = 2000 - 4000, 4 = 4000 - 6000,

5 = 6 thousand - 10 thousand, 6 = 10 thousand - 20 thousand,

7 = 20 thousand - 30 thousand, 8 = 30 thousand - 40 thousand,

9 = 40 thousand - 60 thousand, 10 = 60 thousand - 100 thousand,

11 = 100 thousand - 200 thousand, 12 = 200 thousand - 500 thousand,

13 = 500 thousand - 1 million, 14 = more than 1 million