Table 12 Endogeneity test regression results.
From: Can international railway express improve green total factor productivity?
Instrumental variable method | ||
|---|---|---|
(1) | (2) | |
First stage | Second stage | |
treat×post | GTFP | |
Silk×post | 0.869*** (54.15) | |
Treat×post | 0.033* (1.66) | |
Cons | −1.714*** (−3.33) | −0.530** (−2.00) |
Control variables | YES | YES |
City fixed effect | YES | YES |
Year fixed effect | YES | YES |
Observations | 3360 | 3360 |
R2 | 0.522 | 0.648 |
F-stat | 37.39 | — |
