(1)

(2)

(3)

ainva

aiu

aiud

the treat

7274.701

1.9e−04

3.5es.04

(3.09)

(3.61)

(3.68)

pgdp

−0.025

−0.070

−0.136

(−1.74)

(−2.10)

(−2.31)

secience

0.016

0.026

0.027

(8.31)

(9.66)

(8.84)

thi

0.773

2.865

8.760

(0.48)

(0.76)

(1.23)

sec

0.010

22.819

65.534

(0.00)

(1.17)

(1.89)

Pd

−0.094

−0.190

−0.234

(−1.02)

(−0.99)

(−0.87)

Fc

0.002

0.007

0.012

(1.82)

(3.66)

(3.78)

hstudent

0.000

−0.002

−0.010

(0.35)

(−0.78)

(−2.13)

_cons

−343.117

−1.6e−03

−3.8e−03

(−1.06)

(−2.18)

(−2.82)

N

4109

4109

4109

r2_a

0.539

0.271

F