Table 4 Robustness tests: parallel trend tests.

From: Does vertical supervision enhance labor productivity? Evidence from China’s central environmental protection inspection

Variables

Dependent variable: LP

Coefficients

T-value

Pre4

−0.077

−1.46

Pre3

−0.047

−1.24

Pre2

−0.022

−1.06

Current

0.050**

2.20

Post1

0.148***

3.21

Post2

0.224***

3.17

Post3

0.301***

3.18

Constant

16.473***

85.14

Controls

Yes

Year FE

Yes

Firm FE

Yes

Observations

20,848

Adj R2

0.470

  1. Coefficients marked with **, and *** are significant at 5%, and 1%, respectively.
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