Table 2

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 |

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