(1)

(2)

(3)

(4)

(5)

ainva

aiu

aiud

ginva

giu

Sitenum

182.452

454.116

578.930

(4.35)

(4.25)

(3.87)

Pgdp

0.050

0.088

0.115

0.012

0.057

(2.53)

(2.49)

(2.43)

(2.07)

(2.53)

secience

0.012

0.024

0.030

0.004

0.013

(4.50)

(4.25)

(4.25)

(6.38)

(3.70)

Thi

−0.555

−0.304

−0.092

−0.275

−0.428

(−1.14)

(−0.28)

(−0.06)

(−2.11)

(−0.60)

Sec

−45.940

−92.692

−126.936

−13.830

−56.085

(−2.08)

(−2.29)

(−2.33)

(−1.56)

(−1.93)

Pd

−0.048

−0.139

−0.237

0.273

−0.063

(−0.53)

(−0.96)

(−1.15)

(0.88)

(−0.09)

Fc

0.006

0.014

0.023

0.002

0.008

(2.06)

(2.31)

(2.85)

(1.21)

(1.81)

hstudent

0.004

0.012

0.010

0.002

0.011

(1.35)

(1.73)

(1.13)

(2.06)

(1.79)

L3.treat

241.539

2224.575

(3.35)

(3.97)

_cons

1275.833

2826.926

4143.844

232.461

1484.530

FIX

(1.66)

YES

(1.72)

YES

(1.81)

YES

(0.96)

YES

(1.16)

YES

N

1443

1443

1443

1250

1250

r2_a

0.729

0.748

0.732

0.724

0.705

F

40.644

30.191

23.114

187.686

40.447