Table 3 Threshold Test Effect Results.

From: A dynamic panel threshold model analysis on heterogeneous environmental regulation, R&D investment, and enterprise green total factor productivity

ER type

Threshold type

Threshold

95% Conf. Interval

F

p

CER

Single

3.7900***

[3.635, 3.800]

37.03

0.0000

Double

9.2100***

[8.290, 9.420]

24.76

0.0000

Triple

–

–

9.96

0.5133

MER

Single

8.140 0***

[7.750, 8.290]

32.60

0.0000

Double

3.3000***

[3.250, 3.320]

25.12

0.0000

Triple

–

–

9.23

0.7033

VER

Single

3.7900***

[3.635, 3.800]

41.67

0.0000

Double

8.1400***

[7.775, 8.290]

26.89

0.0000

Triple

–

–

9.68

0.7600

  1. ***, ** and * indicate the statistical significance of 1%, 5% and 10% respectively.
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