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Table 5 The robustness test of the cross terms of industrial characteristic variable and trade cost density (general)

From: Measuring aggregate trade costs and its empirical effects on manufacturing export composition in China

Explanatory variable: χ it 1 2
c i  × T t −3.305*** −3.777***
(−8.20) (−7.06)
c i  × Labor productivity index it −0.001 ***  
(−2.18)
c i  × R & D intensity it   2.678***
(2.25)
Industrial fixed effect Yes Yes
Time-fixed effect Yes Yes
R 2 0.7007 0.7014
Observation 153 153
  1. Note: *** represents a significant level at 1%. The value in the brackets is value of t