变量

(1)

(2)

(3)

lndebt

0.1243932^*

−0.3351408^***

0.1757233^***

(1.96)

(−2.76)

(2.74)

lnpatent

0.1531598^**

−2.36

Cons

−1.902315^***

3.330143^***

−2.412359^***

(−3.60)

(2.95)

(−4.33)

控制变量

YES

YES

YES

N

210

210

210

R²

0.1486

0.786

0.1972