Table 5 Robustness tests.
(1) | (2) | |
---|---|---|
VARIABLES | lnCitepatent | lnCitepatent |
DT_txt | 0.232*** | |
(0.0371) | ||
DT_num | 4.470*** | −0.141*** |
(0.884) | (0.0140) | |
lnage | −0.141*** | 0.00572 |
(0.0140) | (0.00999) | |
soe | 0.00161 | 0.0550*** |
(0.00973) | (0.00443) | |
lnsize | 0.0579*** | 0.144*** |
(0.00440) | (0.0296) | |
lnboard | 0.145*** | 0.0254 |
(0.0295) | (0.0899) | |
indp | 0.0295 | −0.0246 |
(0.0898) | (0.0289) | |
top10 | −0.0344 | −0.0768** |
(0.0289) | (0.0319) | |
Lev | −0.0864*** | 0.00234 |
(0.0319) | (0.00203) | |
liquid | 0.00217 | 0.706*** |
(0.00203) | (0.0904) | |
ROA | 0.620*** | 0.0224** |
(0.0751) | (0.00888) | |
isduality | 0.149*** | |
(0.0373) | ||
maleratio | −0.0281 | |
(0.0194) | ||
ROE | −0.829*** | |
(0.123) | ||
Constant | −0.749*** | −0.829*** |
(0.121) | (0.123) | |
Observations | 22,200 | 22,200 |
R-squared | 0.257 | 0.258 |