Table 4 Heterogeneity analysis of the digital economy affecting technological innovation in cities.

From: Digital economy and urban innovation level: A quasi-natural experiment from the strategy of “Digital China”

Variable

(1)

(2)

(3)

(4)

Substantive innovation

Non-substantive innovation

Western Region

Eastern and Central region

DID

1.255**

1.068

−0.482

2.751**

 

(0.624)

(0.938)

(0.631)

(1.134)

Control variable

YES

YES

YES

YES

N

3123

3123

880

2,243

R-squared

0.256

0.191

0.620

0.444

Urban Effect

YES

YES

YES

YES

Time Effect

YES

YES

YES

YES

  1. ** indicates significance at the 10%, 5%, and 1% levels, respectively, with robustness standard errors in parentheses below.
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