Table 9 Heterogeneity analysis.

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

Variables

(1)

(2)

(3)

(4)

(5)

(6)

SOE

Private firm

Higher share of secondary sector output

Lower share of secondary sector output

More environmental regulations

Less environmental regulations

LP

LP

LP

LP

LP

LP

CEPI

0.044*** (2.82)

0.009 (0.70)

−0.005 (−0.37)

0.093*** (5.05)

0.052*** (3.93)

0.015 (0.97)

Constant

16.602*** (41.21)

16.351*** (73.84)

16.034*** (61.60)

16.576*** (61.17)

17.097*** (55.91)

15.967*** (73.46)

P value for the test of the difference

0.036**

0.000***

0.000***

Controls

Yes

Yes

Yes

Yes

Yes

Yes

Year FE

Yes

Yes

Yes

Yes

Yes

Yes

Firm FE

Yes

Yes

Yes

Yes

Yes

Yes

Observations

7625

11,576

9495

11,353

10,052

10,796

Adj R2

0.523

0.534

0.534

0.519

0.552

0.506

  1. T values are reported in parentheses.
  2. Coefficients marked with **, and *** are significant at 5%, and 1%, respectively.