Producer Services Openness and the Development of Servitization: The Perspective of Two-Way Openness

Table 7

Variable robustness analysis.

Variable	Model 5	Model 6	Model 7
ln jkst	0.004 (0.001)	0.004 (0.002)	0.057 (0.012)
ln fdist	0.017 (0.004)	0.012 (0.003)	0.129 (0.020)
ln ofdist	0.005 (0.002)	0.006 (0.002)	0.012 (0.005)
Rd	0.022 (0.009)	0.040 (0.009)	0.383 (0.056)
Cyjg	0.001 (0)	0.004 (0.001)	0.017 (0.006)
Jzl	0.001 (0)	0.001 (0)	0.004 (0.001)
Yll	0 (0)	0 (0)	0.003(0.002)
Cons	−0.152 (0.041)	−0.151 (0.042)	−1.718 (0.285)
Observation	195	195	195
Id	13	13	13
Hausman	2.47	3.92	5.21
Wald chi2/F	83.27	81.72	185.08

Note. , , and , respectively, represent statistical significance at the level of 1%, 5%, and 10%, and the values in brackets are robust standard errors.