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. 2024 May 8;10(10):e30850. doi: 10.1016/j.heliyon.2024.e30850

Table 5.

Endogeneity problem - instrumental variable regression.

Variable First-stage regression
Second-stage regression
FER FER2 IER PEB NEB
FER −0.109** −0.021
(-2.01) (-0.39)
FER2 0.007** 0.000
(2.44) (0.14)
IER 0.023*** −0.046***
(2.89) (-7.94)
VC −0.183*** −2.949*** 0.050***
(-6.98) (-6.28) (2.93)
GC 0.584*** 11.287*** 0.475***
(7.23) (7.85) (8.47)
TR −0.190*** −3.374*** −0.067***
(-9.96) (-9.84) (-4.12)
Lag1FER 0.462*** −6.678*** 0.107
(3.99) (-3.46) (1.49)
Lag1FER2 0.015** 1.100*** −0.012***
(2.45) (10.65) (-3.04)
Lag1IER −0.137*** −2.721*** 0.824***
(-5.09) (-5.74) (29.35)
Cons 2.455*** 27.650** −1.534*** −0.085 0.315
(3.71) (2.41) (-3.77) (-0.34) (1.28)
Controls Yes Yes Yes Yes Yes
IND & YEAR Yes Yes Yes Yes Yes
N 2756 2756 2756 2756 2756
Adj_R2 0.112 0.257

Note: ***p < 0.01, **p < 0.05, *p < 0.1. Figures in parentheses are robust standard errors. All U-shaped and inverted U-shaped curves passed the U test. To limit the length of the table, Controls represents all control variables.