The impact of industrial internet on high quality development of the manufacturing industry

Figures & data

Figure 1. Mechanism of industrial internet affecting high-quality development of the manufacturing industry.

Table 1. Comprehensive development index of industrial Internet

Index name	Sub index (Unit)	Weight (%)
Contact Degree	Network News (%)	5.41
	Search Engines (%)	4.79
	Instant Messaging (%)	6.92
Sacrifice	Network Music (%)	12.94
	Network Game (%)	14.93
	Online Shopping (%)	9.68
	Online Payment (%)	11.52
Matching Degree	Number of domain names (PCs.)	9.90
	Number of Internet access ports (‘0000)	8.66
	Internet Penetration (%)	8.10
	Total number of Internet users (‘0000)	7.15

Table 2. Variable definition and description

Variable type	Variable name	Variable symbols	Variable definition
Explained variable	Development degree of Manufacturing Industry	DMI	$DM{I}_{it}={\eta }_i\left(\begin{array}{c}L{P}_{it}\\ \begin{array}{c}TF{P}_{it}\\ TP{T}_{it}\\ PMT{A}_{it}\end{array}\end{array}\right)$
Explanatory variable	Industrial Internet comprehensive Development Index	IDI	Synthesis by entropy weighting method
Mediating variable	Intellectualization	Intel	Number of patent applications authorized
	Greening	Green	Green Emission
Control Variable	Government Intervention	GI	Expenditure/GDP
	Fixed Assets Investment	IFA	Fixed Assets Investment/GDP
	Foreign Direct Investment	FDI	Actual Utilization of Foreign Investment/GDP

Table 3. Data descriptive statistics

Variable	Symbol	Average value	Standard deviation	Minimum value	Maximum
High quality Development of Manufacturing Industry	DMI	5.7841	0.2874	5.2694	6.2008
Industrial Internet comprehensive Development index	IDI	0.8059	0.0521	0.7400	0.8819
Intellectualization	Intel	1,398,400	553,449	581,992	2,447,460
Greening	Green	6,000,310	1,942,789	2,343,857	7,353,227
Government Intervention	GI	0.2358	0.0127	0.2181	0.2553
Fixed Assets Investment	IFA	0.5458	0.0321	0.4894	0.5893
Foreign Direct Investment	FDI	0.0141	0.0029	0.0102	0.0184

Table 4. Hausman test

Variable		Model (1) lnIDI	Model (2) lnIDI
Coe.	(b) FE	−2.4192	0.5107
	(B) RE	−2.6027	−1.2990
(b-B) Difference		0.1835	1.8096
Sqrt(diag(V_b-V_B)) S.E.		0.0331	0.1076
chi2(1)		30.69	235.72
Prob>chi2		0.0000	0.0000 (V_b-V_B is not positive definite)
Ind		No	Yes

Table 5. Analysis of total effects of industrial internet

Variable	Model (1) lnDMI	Model (2) lnDMI
lnIDI	4.1919*** (0.2104)	5.3671*** (1.4386)
lnGI		8.0222* (6.8620)
lnIFA		−1.0848* (1.9157)
lnFI		15.0966 (11.4142)
Ind	No	Yes
Obs	280	280
R^2	0.8437	0.9957

Note: The standard error of the robust cluster is in parentheses, * * *, * * and * are significant at 1%, 5% and 10%, respectively, the same below.

Table 6. Intelligent mediation effect test

Variable	Model (1) lnDMI	Model (2) lnIntel	Model (3) lnDMI
lnIDI	5.3671*** (1.4386)	0.7472** (0.5148)	3.7770** (1.0989)
lnIntel			2.1279* (0.6405)
lnGI	8.0222* (6.8620)	3.9429** (2.4554)	−0.3678 (5.3517)
lnIFA	−1.0848* (1.9157)	−0.3577* (0.6855)	−0.3236 (1.3370)
lnFDI	15.0966 (11.4142)	7.1300 (4.0843)	0.0754 (9.0803)
Ind	Yes	Yes	Yes
Obs	280	280	280
R^2	0.9957	0.9908	0.9982

Table 7. Test of intermediary effect of greening

Variable	Model (1) lnDMI	Model (2) lnGreen	Model (3) lnDMI
lnIDI	5.3671*** (1.4386)	1.0551*** (0.7643)	5.4562*** (0.7795)
lnGreen			1.6184*** (0.3399)
lnGI	8.0222* (6.8620)	7.8038** (3.6454)	−4.6076 (4.5663)
lnIFA	−1.0848* (1.9157)	−0.6089* (1.0177)	0.0994* (1.0581)
lnFDI	15.0966 (11.4142)	7.4580 (6.0637)	3.0264 (6.6822)
Ind	Yes	Yes	Yes
Obs	280	280	280
R^2	0.9957	0.9834	0.9989

Table 8. Heterogeneity test

Variable	Eastern region	Central region	Western region
	Model (1)	Model (2)	Model (3)
	lnDMI	lnDMI	lnDMI
lnIDI	7.1046*** (0.365)	6.1823** (0.991)	5.2728*** (0.395)
lnGI	8.6480*** (2.170)	6.0945*** (1.874)	7.0492*** (4.527)
lnIFA	7.4722* (5.8492)	6.8278** (3.4854)	4.4959** (2.3754)
lnFDI	−3.0958* (2.9628)	−0.3789* (1.9376)	−0.6477* (0.6915)
Ind	Yes	Yes	Yes
Obs	110	90	80
R^2	0.7282	0.8086	0.7075

Table 9. Robustness test

Variable	Model (1) lnDMI
lnIDI	4.5936*** (1.5827)
lnGI	6.0269* (3.8268)
lnIFA	−5.9302* (2.3864)
lnFDI	8.9048 (9.0277)
Ind	Yes
Obs	280
R^2	0.9548