Model-1

Model-2

Model-3

Model-4

SER

0.3313***

(9.41)

0.0836**

(3.13)

GOV

0.8288***

(22.64)

0.6835***

(12.69)

PAT

0.4136***

(11.01)

0.0451

(1.28)

SER*PAT

0.0580***

(4.07)

URB

0.3796

(1.12)

−0.0186

(−0.08)

1.1646***

(3.82)

0.0580

(0.25)

INF

0.2569***

(6.25)

0.0792**

(2.74)

0.2181***

(5.45)

0.0690**

(2.44)

POP

−0.0293

(−0.60)

0.0233

(0.71)

0.0459

(0.97)

−0.0200

(−0.60)

TRA

0.1208**

(2.82)

−0.0793**

(−2.61)

0.0381

(0.90)

−0.0635*

(−2.16)

CONS

0.8115

(0.52)

−2.6210**

(−2.90)

−3.6062**

(−2.76)

−1.6445*

(−1.72)

R-sq

0.6996

0.8673

0.7261

0.8795

F

p > F

115.03

0.0000

322.87

0.0000

130.99

0.0000

222.71

0.0000