Table 8 Test for the existence of thresholds.

From: Impact of AI development on green total factor productivity

Variable

Threshold number

F value

P value

threshold

Critical value

1%

5%

10%

TI

single threshold

29.95**

0.0000

12.1005

38.0148

24.2123

18.0758

LNPGDP

single threshold

85.45**

0.0300

11.7058

89.0994

49.3634

32.6898