Producer Services Openness and the Development of Servitization: The Perspective of Two-Way Openness
Table 8
Estimation methods robustness analysis.
Variable
OLS
2SLS
SYS-GMM
ln jkst
0.020 (0.005)
0.031(0.017)
0.005 (0.003)
ln fdist
0.237 (0.015)
0.175 (0.032)
0.276 (0.012)
ln ofdist
0.067 (0.013)
0.003 (0.001)
0.045 (0.015)
Rd
0.358 (0.034)
0.165 (0.046)
0.256 (0.030)
Cyjg
0.023 (0.007)
0.011 (0.005)
0.029 (0.003)
Jzl
0.003 (0)
0.004 (0.001)
0.005 (0.001)
Yll
0.001 (0.001)
0 (0)
0.002 (0.002)
Cons
−2.163 (0.122)
−1.446 (0.328)
−2.152 (0.124)
Sargan
208.349
R2
0.924
0.872
Wald chi2/F
235.11
192.02
535.66
Note. , , and , respectively, represent statistical significance at the level of 1%, 5%, and 10%, and the values in brackets are robust standard errors.
