Research Article
The Impact of Green R&D Activities on SO2 Emissions: Evidence from China
Table 5
Test of threshold effects by selecting the FEP as the threshold variable.
| | Threshold variable | Independent variable | | Threshold value | F | value | 5% critical value |
| | FEP | ln GRD | Single threshold effect | 9.435 | 21.727 | 0 | 3.716 | | Double threshold effect | 1.866, 9.435 | 18.414 | 0 | 4.122 | | Triple threshold effect | 1.866, 3.087, 9.435 | 10.227 | 0 | 3.822 | | ln UGRD | Single threshold effect | 1.866 | 20.653 | 0 | 3.513 | | Double threshold effect | 1.866, 9.435 | 19.933 | 0 | 3.478 | | Triple threshold effect | 1.866, 3.087, 9.435 | 10.113 | 0 | 3.926 | | ln CGRD | Single threshold effect | 9.435 | 19.948 | 0 | 3.626 | | Double threshold effect | 3.087, 9.435 | 18.072 | 0 | 3.291 | | Triple threshold effect | 1.866, 3.331, 9.435 | 8.585 | 0 | 3.612 |
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