变量

OLS_RE (1)

OLS_FE (2)

OLS_RE (3)

OLS_FE (4)

dig

3.953^***

(0.997)

3.400^**

(1.428)

1.546

(0.993)

3.463^**

(1.581)

pgdp

49.812^***

(5.189)

10.203^*

(12.643)

gov

−17.292^*

(9.983)

−74.538^*

(44.955)

rd

14.712^***

(2.361)

8.509^**

(3.693)

trade

−35.780^***

(4.175)

−26.900^***

(9.918)

常数项

−18.520^*

(10.819)

−27.484

(16.996)

364.405^***

(48.959)

211.680

(163.741)

时间固定

否

是

否

是

Hausman检验

12.45^***

16.08^**

LR检验

203.02^***

110.14^***

R²

0.078

0.112