变量

模型1

模型2

模型3

模型4

Ln (Size)

0.513***

0.293***

0.145*

Age

0.032*

0.027*

−0.021

LET

−0.020*

−.008*

−0.017***

ROE

0.004

0.003

0.006

R&D

0.030*

−0.027*

−0.062***

Growth

0.001

0.002

0.002*

Rate

−0.027

0.015

−0.109**

Bank

−0.232**

−0.019*

−0.255*

Exp

−0.111

−0.041

0.114

P_num

0.088***

0.106***

0.172***

Ptype_mu

−0.201*

−0.260*

−0.279**

IPCs

0.034

0.023

0.070**

PFamilycites

−0.082**

−0.078***

−0.100***

Pages

0.051*

0.066**

0.029

Pclaims

0.037*

0.051**

0.093***

Pfamily

0.220***

0.065

0.121*

Models

0.146*

P_num* Model

0.453*

Cons

0.617

5.039***

2.455**

5.568***

R^2

0.412

0.430

0.703

0.715

N

128

128

128

128

F值

10.91***

15.00***

19.81***

24.83***