Table 6 Placebo test.
Variables | AQI | |
|---|---|---|
Advance the establishment time of the GFRIs by four months | Advance the establishment time of the GFRIs by one year | |
(1) | (2) | |
the establishment of | −2.2138 | −1.9634 |
GFRIs | (−1.2673) | (−1.0477) |
Control variables | Y | Y |
Fixed effect | Y | Y |
Obs | 7236 | 7236 |
R2 | 0.3048 | 0.3047 |
