Table 10.

The 2SLS regression results using instrumental variables

First stageSecond stageFirst stageSecond stage
SOPatentsDeltaVegaPatents
(1)(2)(3)(4)(5)
SO 1.430*** (9.46)   
SO_I0.977*** (23.77)    
Delta    −1.372** (−2.04)
Vega    5.552*** (3.70)
Delta_I  0.453*** (2.99)−0.156** (−2.01) 
Vega_I  0.545 (1.38)0.982*** (4.86) 
R&D0.192** (2.28)1.114*** (3.65)0.393* (1.70)0.225* (1.89)1.274 (1.62)
Dual0.043*** (3.04)0.283*** (5.54)0.082** (2.12)0.042** (2.11)0.056 (0.40)
Cash−0.041 (−0.93)−0.019 (−0.12)−0.025 (−0.18)0.077 (1.07)−1.104** (−2.38)
Roe0.038** (2.20)0.026 (0.43)0.703*** (3.10)−0.120 (−1.03)2.517** (2.53)
Grow−0.038*** (−3.22)−0.233*** (−5.38)−0.252*** (−7.13)−0.071*** (−3.90)−0.247** (−1.37)
Size0.069*** (9.57)0.683*** (24.28)0.347*** (14.75)0.190*** (15.73)0.299 (1.22)
Tech−0.001 (−0.08)0.368*** (6.43)−0.006 (−0.13)−0.002 (−0.07)0.127 (0.85)
IndustryYesYesYesYesYes
YearYesYesYesYesYes
F-value36.12***78.56***19.99***17.88***16.52***
Hausman test44.65***N/A11.78*** N/A
Adj-R2 (%)27.2343.6140.2137.416.35
n3,5673,567933933933

Notes:

***p < 0.01; **p < 0.05; *p < 0.1

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