Table 9 Inspection of inverted U regulation effect on NGPA.

From: Impact of coal-to-gas transition on individual welfare considering the inverted U-shaped regulation effect of natural gas pipeline accessibility

Variable

LH

PH

(1)

(2)

(3)

(4)

CTGT

1.294*** (0.212)

− 4.101*** (0.396)

0.473** (0.204)

0.645* (0.331)

NGPA

0.364*** (0.031)

− 3.269*** (0.222)

− 0.298*** (0.033)

2.135*** (0.256)

CTGT × NGPA

0.353*** (0.068)

5.329*** (0.326)

0.821*** (0.072)

0.886*** (0.280)

NGPA2

 

0.585*** (0.036)

 

− 0.385*** (0.041)

CTGT × NGPA2

 

− 0.843*** (0.056)

 

− 0.100** (0.049)

Control variable

Controlled

Controlled

Controlled

Controlled

Pseudo R2

0.126

0.182

0.194

0.225

Observation

3080

3080

3080

3080

  1. *, **, and *** denote statistical significance at the 10%, 5%, and 1% levels, respectively. Robust standard error in brackets. The results of the utest command indicate that the slopes of the regulation effect of NGPA exhibit an initial positive followed by a negative pattern, suggesting an inverted U-shaped relationship. The overall tests for the existence of this inverted U-shape are statistically significant at the 1% and 10% levels, respectively. The findings are robust.
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