| Variable name | Variable meaning |
| gdp | gross domestic product of each city (100 million yuan) |
| tii | the value-added of the tertiary industry of each city (100 million yuan) |
| fai | fixed assets investment of each city (100 million yuan) |
| fdi | foreign direct investment of each city (100 million yuan)) |
| iet | total import and export volume of each city (100 million yuan) |
| fbe | the total budgetary revenues and expenditures of local governments of each city (100 million yuan) |
| rde | highway density of each city (kilometre/100 Square kilometre) |
| ocs | the number of students in regular colleges and universities per 10000 people of each city (person) |
| scrt | total retail sales of social consumer goods of each city (100 million yuan) |