Main variables and calculation methods
| Abbreviations . | Variables . | Calculations . |
|---|---|---|
| water | Discharge of industrial wastewater | The logarithm of industrial wastewater discharge |
| digital | Digital economy | Estimation of digital economy based on the variable selection part |
| pgdp | Economic development | The logarithm of per capita GDP |
| Sq_pgdp | Economic development | The square of the logarithm of per capita GDP |
| population | Population density | The logarithm of total population |
| industrial | Industrial development | The ratio of the added value of secondary industry to GDP |
| expenditure | Fiscal expenditure | The ratio of fiscal expenditure to GDP |
| hum | Human capital | The ratio of the number of college students to the population |
| finance | Financial development | The ratio of various loan balances of financial institutions to GDP |
| Abbreviations . | Variables . | Calculations . |
|---|---|---|
| water | Discharge of industrial wastewater | The logarithm of industrial wastewater discharge |
| digital | Digital economy | Estimation of digital economy based on the variable selection part |
| pgdp | Economic development | The logarithm of per capita GDP |
| Sq_pgdp | Economic development | The square of the logarithm of per capita GDP |
| population | Population density | The logarithm of total population |
| industrial | Industrial development | The ratio of the added value of secondary industry to GDP |
| expenditure | Fiscal expenditure | The ratio of fiscal expenditure to GDP |
| hum | Human capital | The ratio of the number of college students to the population |
| finance | Financial development | The ratio of various loan balances of financial institutions to GDP |