(1)

(2)

VARIABLES

rd

rd

did

0.454***

0.518***

(3.75)

(4.33)

size

1.040***

(19.40)

lev

−4.677***

(−14.72)

cashflow

−0.361

(−0.46)

roe

−0.114

(−0.26)

growth

0.686***

(3.88)

tobinq

0.031

(1.10)

Constant

15.249***

−6.048***

(198.91)

(−5.32)

Observations

12,714

12,714

R-squared

0.399

0.431

industry

YES

YES

year

YES

YES