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ARMA analysis of the green innovation technology of core enterprises under the ecosystem – Time series data


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Fig. 1

Schematic diagram of the green innovation ecosystem
Schematic diagram of the green innovation ecosystem

Fig. 2

The main player in BYD green innovation ecosystem and its concerns
The main player in BYD green innovation ecosystem and its concerns

Autocorrelation and Partial Autocorrelation Test of Granted Green Patent

LAG AC PAC Q Prob>Q [Autocorrelation] [PartialAutocor]

1 0.7687 0.9657 12.512 0.0004 | – – – | – – –
2 0.4996 0.0542 18.129 0.0001 | – - |
3 0.3083 0.0737 20.41 0.0001 | – |
4 0.1342 −0.0321 20.873 0.0003 |- |
5 −0.0023 0.2998 20.873 0.0009 | | –

Several landmark events in BYD's green innovation process

Year Landmark events

2003 Chuanfu Wang announced that he would enter the automobile and new energy automobile industries.
2005 When the outside world was not optimistic about the prospects of electric vehicles, BYD set up a research and development team and began to deploy in the IGBT field.
2008 BYD launched the world's first dual-mode electric vehicle F3 DM that does not rely on professional charging stations, unveiling the large-scale commercialisation of new energy vehicles;BYD acquired the semiconductor manufacturing company Ningbo Zhongwei for nearly 200 million yuan, integrated the upstream industry chain of electric vehicles, and accelerated the commercialisation of BYD electric vehicles.
2009 BYD plans to launch pure electric vehicles.
2010 BYD found the solution of ‘Urban Bus Electrification.’
2012 BYD introduced the pure electric model BYD E6, the plug-in hybrid model BYD Qin, BYD Tang and other models to the market.
2013 BYD completed the research and development of core energy storage technology, which proved the safety and feasibility of battery energy storage technology and brought about the commercial application of battery energy storage.
2018 BYD's IGBT 4.0, an automotive-grade product, was released in Ningbo. At the China Electric Vehicles Forum, Chuanfu Wang called on the state to provide more policy support for plug-in hybrid vehicles, including financial subsidies and abolition of consumption tax.
2021 Chuanfu Wang pointed out that digital transformation is an important direction for the transformation of the automotive industry, and he would build more digital factories for electric vehicles and core components, and advance the strategic goal of Industry 4.0.BYD initiated a study on carbon neutrality planning.

The regression result of AR(1)

Zls Coef. Std. Err. z P>|z| [95% Conf. Interval]

zls
_cons 105.8925 77.4997 1.37 0.172 −46.004 257.7891
Ar
L1. 0.952 0.136 7.00 0.000 0.6854 1.2185
sigma 27.5112 5.0574 5.44 0.000 17.5982 37.4236

Residual autocorrelation and partial autocorrelation test of green patent grants

LAG AC PAC Q Prob>Q [Autocorrelation] [Partial Autocor]

1 −0.0075 −0.0114 0.0012 0.9724 | |
2 −0.035 −0.0177 0.0287 0.9858 | |
3 0.1021 0.1452 0.27899 0.9639 | |-
4 −0.0982 −0.058 0.52696 0.9708 | |
5 −0.1649 −0.1973 1.2801 0.937 -| -|

The regression result of ARMA(1,1)

zls Coef. Std. Err. z P>|z| [95% Conf. Interval]

zls
_cons 103.7264 67.6132 1.53 0.125 −28.7931 236.2459
ARMA
ar
L1. 0.9259 0.184 5.03 0.000 0.5652 1.2865
ma
L1. 0.1804 0.2873 0.63 0.53 −0.3827 0.7435
sigma 27.166 4.9591 5.48 0.000 17.4462 36.8857
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Life Sciences, other, Mathematics, Applied Mathematics, General Mathematics, Physics