Table 2 Dynamic effects of the opening of the CR express service on city GTFP - parallel trend assumption test regression results.
From: Can international railway express improve green total factor productivity?
α−2 | α−1 | α0 | α1 | α2 | |
|---|---|---|---|---|---|
GTFP | −0.008 (−0.52) | −0.005 (−0.34) | 0.028* (1.80) | 0.028* (1.84) | 0.024* (1.85) |
Intercept | −1.755*** (−3.39) | −1.764*** (−3.41) | −1.682*** (−3.76) | −1.765*** (−3.42) | −3.470*** (−3.07) |
Control variables | YES | YES | YES | YES | YES |
Year fixed effect | YES | YES | YES | YES | YES |
City fixed effect | YES | YES | YES | YES | YES |
Observations | 516 | 516 | 516 | 516 | 516 |
R2 | 0.312 | 0.311 | 0.306 | 0.316 | 0.339 |
