Table 9 Threshold effect test.

From: Threshold effect of technological innovation on carbon emission intensity based on multi-source heterogeneous data

Variables

Number of thresholds

F value

P value

Estimated value of threshold

95% confidence interval

BS times

Economic development level

Single threshold

97.39

0.00

2.37

2.32

− 2.37

300

Double threshold

43.98

0.01

2.54

1.71

2.44

1.69

− 2.54

− 1.72

300

Triple threshold

44.66

0.28

2.26

2.21

− 2.27

300

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