Table 7 The result of Inverse U shape test.

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

 

Lower bound

Upper bound

Interval

2.599

9.7

Slope

0.413

−0.988

t-value

2.357

−5.433

P > |t|

0.009

4.30E-08

  1. The p-value of Overall Inverse U shape = 0.009.
  2. Inflection point = 4.693.
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