Table 5 Unit root test.

From: Nonlinear relationship between intellectual property protection and renewable energy innovation in 27 countries

Variable

I(0)

I(1)

Level of integration

REI

−3.381a

 

I (0)

IPP

−3.048a

 

I (0)

FDI

−3.646a

 

I (0)

Fiscal

 

−3.722a

I (1)

Trade

 

−3.532a

I (1)

  1. ap < 0.01.
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