Table 4 Robustness test.

From: The impacts of technological overlap on international collaboration in China’s green innovation endeavors

Variables

Panel A: the length of the observation period

Panel B: Weighted

technological overlap

Two years

Four years

Five years

(1)

(2)

(3)

(4)

Overlapijt−2

0.318***

(2.76)

   

Overlapijt−3

 

0.229**

(2.30)

 

0.202***

(2.61)

Overlapijt−4

  

0.240**

(2.15)

 

FEit,FEit,FEij

Yes

Yes

Yes

Yes

N_clust

18,166

18,166

18,166

18,166

r2_a

0.220

0.409

0.507

0.314

N

290,656

254,324

236,158

272,490

  1. Note: We adjusted the lag lengths of the explanatory variable and control variables according to the lengths of the observation periods in Panel A; the independent variable in Panel B is the weighted technological overlap by cited times.
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