Robustness test of modified samples
| . | Discharge of industrial wastewater . | ||
|---|---|---|---|
| digital | − 0.1167*** (0.035) | − 0.1148*** (0.034) | −0.2812*** (0.061) |
| pgdp | − 2.5071*** (0.884) | − 1.9239** (0.753) | −1.9109*** (0.734) |
| Sq_pgdp | 0.1010** (0.039) | 0.0761** (0.034) | 0.0748** (0.033) |
| population | − 0.7350** (0.287) | − 0.3485 (0.301) | −0.1029 (0.284) |
| industrial | 1.6800*** (0.530) | 2.0963*** (0.508) | 2.1246*** (0.498) |
| expenditure | − 0.2295*** (0.081) | − 0.2094 (0.128) | −0.1827 (0.133) |
| hum | − 0.0311 (0.029) | − 0.0332 (0.029) | −0.0233 (0.029) |
| finance | − 3.3793 (3.179) | − 2.6745 (2.899) | −2.6028 (2.853) |
| dummy1 | −0.7979 (3.737) | ||
| dummy2 | 2.7386* (1.509) | ||
| dummy1*digital | 0.2633*** (0.071) | ||
| dummy2*digital | −0.0018 (0.003) | ||
| watert−1 | 0.2981*** (0.104) | 0.3048*** (0.090) | 0.3281*** (0.085) |
| Constant | 24.7348*** (5.910) | 17.7734*** (4.840) | 17.0239*** (4.732) |
| N | 1,405 | 1,405 | 1,405 |
| AR(2) | 0.2601 | 0.3339 | 0.5696 |
| . | Discharge of industrial wastewater . | ||
|---|---|---|---|
| digital | − 0.1167*** (0.035) | − 0.1148*** (0.034) | −0.2812*** (0.061) |
| pgdp | − 2.5071*** (0.884) | − 1.9239** (0.753) | −1.9109*** (0.734) |
| Sq_pgdp | 0.1010** (0.039) | 0.0761** (0.034) | 0.0748** (0.033) |
| population | − 0.7350** (0.287) | − 0.3485 (0.301) | −0.1029 (0.284) |
| industrial | 1.6800*** (0.530) | 2.0963*** (0.508) | 2.1246*** (0.498) |
| expenditure | − 0.2295*** (0.081) | − 0.2094 (0.128) | −0.1827 (0.133) |
| hum | − 0.0311 (0.029) | − 0.0332 (0.029) | −0.0233 (0.029) |
| finance | − 3.3793 (3.179) | − 2.6745 (2.899) | −2.6028 (2.853) |
| dummy1 | −0.7979 (3.737) | ||
| dummy2 | 2.7386* (1.509) | ||
| dummy1*digital | 0.2633*** (0.071) | ||
| dummy2*digital | −0.0018 (0.003) | ||
| watert−1 | 0.2981*** (0.104) | 0.3048*** (0.090) | 0.3281*** (0.085) |
| Constant | 24.7348*** (5.910) | 17.7734*** (4.840) | 17.0239*** (4.732) |
| N | 1,405 | 1,405 | 1,405 |
| AR(2) | 0.2601 | 0.3339 | 0.5696 |
T-statistics are reported in parentheses.
*Significance at the 10% level.
**Significance at the 5% level.
***Significance at the 1% level.