Research on the Regional Di ﬀ erences and Inﬂuencing Factors of the Innovation E ﬃ ciency of China’s High-Tech Industries: Based on a Shared Inputs Two-Stage Network DEA

: Innovation ability has become one of the core elements in the pursuit of China’s green growth, and high-tech industries are playing a leading role in technological innovation in China. With the rapid development of China’s high-tech industries, their innovation e ﬃ ciency has attracted widespread attention. This article aims to illustrate a shared inputs two-stage network Data Envelopment Analysis (DEA), to measure the innovation e ﬃ ciency of high-tech industries in China’s 29 provinces from 1999 to 2018. The results indicate that there are obvious di ﬀ erences in the innovation e ﬃ ciency of the provinces. The technology development e ﬃ ciency, the technical transformation e ﬃ ciency, and the overall innovation e ﬃ ciency of the developed east coast provinces are generally higher than those of the backward central and western provinces. This article further applies the spatial econometrics model to analyze the factors inﬂuencing the innovation e ﬃ ciency of high-tech industries. We have found that government support, R&D input intensity, industries aggregation, economic extroversion, and the level of development of the modern service industries cause varying degrees of impact on innovation e ﬃ ciency. ciency holistic innovation ciency of high-tech the of the e ciency


Introduction
Since the implementation of the reform leading to a more open international policy, China has witnessed rapid economic development, with an average annual growth rate of 9.6% between 1978 and 2018. However, this mode of extensive economic growth pursues rapid economic growth one-sidedly and ignores the quality of economic growth, generating serious resource waste, environmental pollution and environmental damage. It is very important for the Chinese government to promote an ecological society while exploring the path of economic development. The Chinese government has set a goal of High-quality Development that is an organic combination of China's national conditions and green growth [1], and has ratified over 30 conventions and protocols related to environmental protection, which cover every aspect of economic development and environmental regulations, as of 2017.
The concept of "green growth" has attracted considerable worldwide attention since it was first put forward by the Economic and Social Commission for Asia and the Pacific, at the United Nations Economic and Social Commission for Asia and the Pacific Conference (UNESCAP) in 2005 [2]. According to the Organization for Economic Cooperation and Development (OECD), green growth can help to mitigate environmental pollution, biodiversity loss and climate changes, and promote a sustainable use of resources and the environment while fostering economic growth and development [3]. The Porter Hypothesis made scholars and policymakers realize that appropriate environmental

Theoretical Hypothesis
Many studies in the literature focus on innovation efficiency and the factors influencing China's high-tech industries. Guan and Chen employed a relations network DEA to estimate the efficiency of China's high-tech industries' innovation and R&D areas, by using its high-tech industries area data [16]. Michael et al. applied the Germ-Parameter's approach to analyze the influence of R&D upon the productivity of China's high-tech industries and found that there is a regional difference in the influence of R&D investment and technological progress on the productivity of the nation's high-tech industries [17]. Yang looked at the R&D innovation efficiency of high-tech industries and its influencing factors, taking China's high-tech industries' regional panel data during [1995][1996][1997][1998][1999][2000][2001][2002][2003][2004][2005][2006][2007][2008][2009] and applying the stochastic frontier model [18]. Liu and Zhang used a three-stage DEA model to measure the innovation efficiency of foreign-invested and state-owned enterprises in China's high-tech industries, while excluding the impacts of environmental variables such as government funding, qualification of technical personnel, R&D atmosphere, average enterprise scale, and hardware base in the industries [19]. Chen and Meng combined a network SBM model with a DEA window analysis to measure the technological innovation efficiency of China's high-tech industry during 2000-2011. The research indicated a rising trend in the overall efficiency of the technological innovation of the high-tech industry in the past 10 years, and showed that the outbreak of the financial crisis had a negative impact on the efficiency of technological innovation in the short term [20]. Zhou et al. took China's 56 national high-tech zones as the research objects and discussed the decomposition, features, and diversity issues of the operational efficiency of the high-tech zones, based on a DEA evaluation of their comprehensive efficiency, pure technical efficiency, and scale efficiency. They found that the operating efficiency of China's high-tech zones characterizes their cycle development, and that the low efficiency of the "first entrepreneurship" and "secondary entrepreneurship" stages results from their invalid scale efficiency and pure technical efficiency [21]. Liu and Ning utilized the panel data of Chinese intelligent manufacturing enterprises during 2010-2013 to evaluate their technology innovation efficiency. The study showed that the average technology innovation efficiency of intelligent manufacturing industries was in the rising stage, but the overall efficiency was still relatively low [22]. Fu and Jiang applied a Fuzzy-Set Qualitative Comparative Analysis (fs-QCA) to conduct a multiple-case analysis with a triple helix dynamic cooperation model (university-industry-government) and found positive effects of multiple participants on regional radical innovation in China [23].
Meanwhile, when the above literature measures the innovation efficiency of China's high-tech industries, a decision making unit (DMU) is considered a "black box", and these studies only consider the external characteristics of the DMU, ignoring its internal structure. Therefore, the result has some deviations and does not reflect the real situation of high-tech industries. Fare and Grosskopf proposed a network DEA, decomposed the DMU into a "gray box", found the inside efficiency of the production process while evaluating the DMU's overall efficiency, and enhanced the separability of the evaluation results [24]. Since then, many scholars have begun to study the production process with a two-phase structure.
Cook et al. pointed out a two-stage process in the banking industries. In the first stage, a bank produces intermediate variables, deposits, through the consumption of fixed assets, labor, and investment in information technology. In the second stage, the bank uses the deposits to produce loan and profit [25]. Seiford and Zhu studied the marketing and profitability of Fortune 500 companies [26]. Kao and Wang applied the analysis of the two-stage process to Taiwan's non-life insurance industries [27]. Chen and Guan made use of the transforming information of the intermediate product and the configuration information of the input factors to build a two-stage network DEA efficiency measurement and decomposition model that has shared inputs under the hypothesis of constant returns to scale and variable returns to scale [28]. Rui et al. built up the shared inputs two-stage network DEA model based on the output of scientific and technological achievements of high-tech industries and inputted the scientific and technological achievements into productive forces [29]. Lu et al. presented an application of a two-stage network DEA for examining the performance of 30 U.S. airline companies [30]. Ye and Liu suggested that a network DEA can calculate not only the efficiency of a system and its subprocesses, but also the production information embedded in the intermediate products, as well as the allocation information of various inputs among the individual subprocesses. While maintaining a high level of R&D investment, it is necessary to increase the ability to transform scientific and technological achievements [31].
Therefore, theoretical Hypothesis 1 is proposed in this paper: The shared inputs Two-stage Network DEA Model is more appropriate to reflect the internal structure characteristics of the DMUs when calculating the innovation efficiency of high-tech industries, thereby accurately showing the regional differences.
Current research on the factors influencing the regional differences in the innovation efficiency of China's high-tech industries has given priority to empirical research models, overlooking the analysis of the influencing factors and mechanisms. Liu and Buck used a panel data analysis to empirically investigate the impact of different channels for international technology spillover on the innovation performance of Chinese high-tech industries. They found that both international technology spillover sources and indigenous efforts jointly determine the innovation performance of Chinese high-tech sectors [32]. Feng et al., based on the panel data of large and medium-sized industrial enterprises in China from 2005 to 2007, used a stochastic frontier (SFA) analysis to study the impact of domestic technology purchases, foreign technology introduction, and foreign-funded enterprise technology activity spillover on regional industrial innovation performance. They found significant differences and imbalances in the eastern, central, and western regions [33]. Yin applied network SBM and Tobit models to evaluate and analyze the innovation efficiency of China's high-tech industries, and found that regional economic strength, industrial structure, and government support can significantly improve the regional innovation efficiency [34]. Li et al. applied a convergence model to analyze the innovation efficiency differences and their changing trends in Chinese provinces. Based on data regarding the innovation efficiency of high-tech industries from 2002 to 2011, they point out that technological labor capital and high-tech capital are the conditional convergence factors for the overall regional differences [35]. Chen, Heng, et al. constructed the evaluation index system of technological innovation efficiency using a DEA model with the data of 28 provincial regions from 2008 to 2014, and evaluated the efficiency of high-tech industries. They found regional differences between provinces and pointed out that they may result from the utilization rate of innovation resources [36]. Liu et al. constructed an improved SBM-DEA model to measure the green technology innovation efficiency of China's high-tech industries by dividing the regions of China into four clusters, and study the influence degree and regional differences of various influencing factors through quantile regression method. The research shows that the factors significantly affecting green innovation efficiency are different in various regions [37].
These studies are rich and detailed, including different perspectives, different regions, and different methods. However, most studies focus on how to measure the effectiveness of high-tech industry innovation efficiency, lacking an in-depth analysis of the factors responsible for the regional differences in technical innovation. Accordingly, we planned to measure the factors that affect the regional differences based on the results of Hypothesis 1, through a spatial econometric model. This led us to propose a second theoretical hypothesis: Hypothesis 2. Government support, R&D input intensity, industries aggregation, economic extroversion, and the development level of modern service industries are the main factors causing the regional differences in China's High-tech Industries' Innovation Efficiency.

Brief Introduction to the Research Approach
To reach the goals set above, we designed the research approach of this paper as follows. Firstly, an analysis of the features of the innovation process to select a suitable model. The innovation process of high-tech industries is divided into the technical development phase and the technical transformation phase, and the intellectual, scientific, and technological achievements are the intermediate variables of innovation in high-tech industries, which is to say that the output of the technical development phase is the input of the technical transformation phase. Secondly, this paper uses the shared inputs two-stage network DEA model to measure the innovation efficiency of high-tech industries in China's 29 provinces from 1999 to 2018, to analyze the regional differences in the innovation efficiency of high-tech industries and calculate the technology development efficiency, the technical transformation efficiency, and the overall innovation efficiency. Thirdly, we have built a spatial econometric model to analyze the impact of government support, R&D input intensity, industries aggregation, economic extroversion, and the level of development of modern service industries on the innovation efficiency of high-tech industries, and to explore the reasons for the regional differences in innovation efficiency of China's high-tech industries.

Methods: Shared Inputs Two-Stage Network DEA
According to Fare's network DEA, the technological innovation process can be divided into two stages [24]. The first stage is technological development, which transforms innovation input into intellectual scientific-technology (sci-tech) achievements. The second stage is technological conversion, which is the industrialization of intellectual sci-tech achievements. Therefore, innovation input (sci-tech achievements) and the industrialization of those sci-tech achievements form the whole technological innovation system, whose efficiency reflects the innovation ability. Technological development efficiency shows the ability to use human resources and capital for innovation, while technological conversion efficiency reveals the ability to use technology for commercialization and marketization of sci-tech achievements (as shown in Figure 1). To reach the goals set above, we designed the research approach of this paper as follows. Firstly, an analysis of the features of the innovation process to select a suitable model. The innovation process of high-tech industries is divided into the technical development phase and the technical transformation phase, and the intellectual, scientific, and technological achievements are the intermediate variables of innovation in high-tech industries, which is to say that the output of the technical development phase is the input of the technical transformation phase. Secondly, this paper uses the shared inputs two-stage network DEA model to measure the innovation efficiency of high-tech industries in China's 29 provinces from 1999 to 2018, to analyze the regional differences in the innovation efficiency of high-tech industries and calculate the technology development efficiency, the technical transformation efficiency, and the overall innovation efficiency. Thirdly, we have built a spatial econometric model to analyze the impact of government support, R&D input intensity, industries aggregation, economic extroversion, and the level of development of modern service industries on the innovation efficiency of high-tech industries, and to explore the reasons for the regional differences in innovation efficiency of China's high-tech industries.

Methods: Shared Inputs Two-Stage Network DEA
According to Fare's network DEA, the technological innovation process can be divided into two stages [24]. The first stage is technological development, which transforms innovation input into intellectual scientific-technology (sci-tech) achievements. The second stage is technological conversion, which is the industrialization of intellectual sci-tech achievements. Therefore, innovation input (sci-tech achievements) and the industrialization of those sci-tech achievements form the whole technological innovation system, whose efficiency reflects the innovation ability. Technological development efficiency shows the ability to use human resources and capital for innovation, while technological conversion efficiency reveals the ability to use technology for commercialization and marketization of sci-tech achievements (as shown in Figure 1). Suppose that there are n DMU, and each DMU j is equipped with initial input x ij , s final output y sj , and q intermediate product z qj . The following two points should be taken into account. First, initial input x ij does not run out in the first stage, being allocated instead in the two subprocesses, in some proportion that differs from the difference of the DMU. The discretionary input of x ij in the first stage is α i x ij , and (1−α i )x ij is used for the discretionary input in the second stage. Second, the re-input of intermediate products should be considered. In the whole process, intermediate product z qj is the output of the first stage as well as the input of the second stage.
Referring to Castelli's method of model setting, this paper structures the shared inputs two-stage network DEA model as follows [38]. Decision variables υ 1 i and υ 2 i (i = 1, 2, · · · , m) respectively represent the weight of the two parts' input in the process. In addition, ω 1 p and ω 2 p (p = 1, 2, · · · q) are respectively the output of intermediate product z qj in the first stage and the weight of the input in the second stage. The weight of output y sj is presented as decision variable u r (r = 1, 2, · · · , s). In accordance with Charnes' theory of the DEA ratio model [39], the holistic technology efficiency of the DMU in output growth is expressed in Appendix A. Then, after using the Charnes-Cooper transformation [39,40], we could get the mathematical programming model directly on the assumption of VRS.
To facilitate calculation, the non-linear programming should be transformed into linear programming as follows: Formula (1) describes the input-oriented DMU holistic technology efficiency measuring model. Once the optimal combinations of decision variables (1), the value of the technology efficiency of the first stage and the second stage in the production process could be calculated by Formulae (2) and (3).

Selection of Variables
As regards the inputs in the process of technological development, as the latter transforms innovation resources into intellectual sci-tech achievements, the core elements of technological development consist of R&D researchers and R&D capital. This paper selects the full-time equivalents of the high-tech industries' R&D researchers as the input variables and the internal expenditure of the high-tech industries' R&D expense as the input variable of R&D capital. Owing to the influence of the input of R&D expense in each stage on the output of technological innovation, this paper transforms the internal expenditure of R&D expense into internal expenditure stock to measure the R&D input. The specific calculation is K t = θ (t−1) + (1 − δ)K (t−1) , where K t is the internal expenditure of R&D expense of a certain province's high-tech industries in year t, δ is the depreciation rate of R&D capital, and θ t−1 is the discounted R&D input of the high-tech industries in year t − 1. Suppose that the growth rate of the high-tech industries' R&D expense is equal to that of the R&D expense input. The initial value of the R&D expense input can be set as K 0 = θ 0 /(g + δ), where g is the annual growth rate of the R&D expense input. Like most scholars, we considered the depreciation rate of R&D capital to be δ = 15%.
As regards the outputs in the process of technological development and the inputs in the process of technological conversion, the former are mainly intellectual sci-tech achievements, including patent technology and non-patent technology. A patent, which involves the legal protection of sci-tech knowledge, is a formally recognized innovative product. As a commercial secret of enterprises, non-patent technology is not protected in legal form and is mainly used for improving the production process and competitiveness. The inputs of this process are the outputs of technological development. Sci-tech achievements can be obtained in technological innovation activities and through transactions in the technology market, while a commercial secret is not available through those methods. Therefore, this paper selects the turnover in patents and the technology market as the outputs of technological development and the inputs of technological conversion.
As regards the outputs of technological conversion, since the latter amounts to the process of industrializing intellectual sci-tech achievements, it involves product innovation achievements and process innovation achievements. This paper uses the sales revenue of a new product to measure product innovation and the total output value of high-tech industries to measure process innovation.

Introduction of Data
This paper selects 29 Chinese provinces (autonomous regions and municipalities: hereinafter referred to as provinces) from 1999 to 2018 as the analyzing samples, Tibet and Xinjiang are excluded due to serious data shortages, and Taiwan, Hong Kong, and Macao are not included in the scope of the analysis. The data come from the China Statistical Yearbook, China Statistics Yearbook on High Technology Industry, and the relevant statistical yearbooks of these provinces. Regarding default data, this paper completes the mean of the data referring to the year before and after. As the State Council did not approve the establishment of Chongqing as a municipality directly under the central government until 1997, data on Chongqing's high-tech industries in 1997 are taken from the Chongqing Statistical Yearbook and relevant government gazettes.
Due to the long time span of the data, and to avoid the influence of inflation and deflation on price-related time series data, this paper uses a fixed assets investment index to conduct a price deflator to index sequential data of price-related new product value and internal expenditure of R&D expense. We then transform the data calculated with current prices into the data calculated with prices in 1995. Generally speaking, in technological development there is a time lag between resource input and technological achievements, as well as the industrialization of sci-tech achievements. Consequently, the data of the initial input, intermediate output, and final output in this paper are respectively those of years t, t + 1, and t + 2, meaning that the input index of technological development is selected from the data from 1996 to 2016, the output index of technological development from the data from 1997 to 2017, and the final output index of technological innovation from the data from 1998 to 2018.

Results
This paper uses DEA-solver 6.0 to estimate the innovation efficiency of high-tech industries from 29 Chinese provinces from 1999 to 2018. Table 1 lists the results, and the value of E 1 and E 2 are expressed on the maps shown in Figure 2.   The findings from the estimated results of technological development efficiency, technological conversion efficiency, and holistic innovation efficiency are as follows.
First, judging from the technological development efficiency (E 1 ), the technological development efficiency of the high-tech industries in Beijing, Shanghai, and Shaanxi is high and respectively 0.696, 0.688, and 0.631, while that in Hainan, Qinghai, and Guizhou is low and respectively 0.157, 0.173, and 0.186. As the main locations of China's institutions of higher learning, Beijing, Shanghai, and Shaanxi are equipped with sufficient high-end technical talent, which may result in a high technological development efficiency. However, in backward provinces like Hainan, Qinghai, and Guizhou, the shortage of research institutions and high-end technical talent brings about a low technological development efficiency.
Second, the results of technological conversion efficiency (E 2 ) show that the technological conversion efficiency of the high-tech industries in Shanghai, Beijing, and Guangdong is high, while that in Qinghai, Guizhou, and Gansu is low. In developed provinces, such as Shanghai, Beijing, and Guangdong, the degree of market opening is higher, and modern service industries are relatively intact, with an active technology market that contributes to the industrialization of intellectual sci-tech achievements. In contrast, in western provinces like Qinghai, Guizhou, and Gansu, the lack of innovation resources leads to the high cost of innovation and low technological conversion efficiency.
Third, judging from the holistic efficiency (E), the provinces' high-tech industries distinctly differ in innovation efficiency, which in eastern coastal provinces is usually higher than that of central and western provinces. For example, the gap between Beijing's and Qinghai's innovation efficiency reaches 0.588. The high-tech industries' technological innovation is a complex indicator, and the efficiency, influenced by many factors, is the symbol of a region's economic and social strength. Consequently, the innovation efficiency of high-tech industries in backward regions is relatively low.
Fourth, a comparison of the three kinds of efficiency shows that in backward provinces, technological development efficiency is higher than holistic innovation efficiency, which is higher than technological conversion efficiency. For example, technological development efficiency, technological conversion efficiency, and holistic innovation efficiency in Guizhou Province are respectively 0.172, 0.186, and 0.167. In developed provinces, among the three kinds of efficiency, technological conversion efficiency is the highest, followed by holistic innovation efficiency, and technological development efficiency is the lowest. For example, technological development efficiency, technological conversion efficiency, and holistic innovation efficiency in Shanghai are respectively 0.726, 0.688, and 0.817. This indicates that in developed regions, a higher technological conversion efficiency promotes the holistic innovation efficiency of high-tech industries, while in backward regions, a lower technological conversion efficiency restrains, to some extent, the holistic innovation efficiency of these industries.

Discussion
The above-mentioned analysis shows that the innovation efficiency of China's high-tech industries in different regions differs considerably. What are the resulting factors? Based on the measurement of high-tech industries' innovation efficiency, this paper explores the influencing factors.

Main Influencing Factors of China's High-Tech Industries' Innovation Efficiency
The innovation of high-tech industries depends on a complicated engineering system, influenced by many factors. Referring to the conclusions of the existing literature, this paper mainly analyzes the effect of government support, R&D input intensity, industries agglomeration, outward economy, and the degree of development of modern service industries on China's high-tech industries' innovation efficiency.
Government support (RS). In order to enhance the regional competitiveness of high-tech industries, China's provincial governments give different levels of support to these industries. The government uses public finance to support the innovation of high-tech industries, which contributes to an improvement in innovation efficiency. The proportion of R&D expenses in the GDP is used to measure a province's support to the innovation of high-tech industries.
R&D input intensity (II). Most high-tech industries are characterized by a high input and a high risk. The higher the R&D, the larger the R&D capital, which makes it easier to exert the scale effect of R&D capital and improve innovation efficiency. The proportion of R&D expense in the main business income can be used to measure the R&D input intensity of a province's high-tech industries.
Industries agglomeration (IA). Industries agglomeration results in the agglomeration of the innovation element. Most researchers hold the view that the agglomeration of the innovation element has a positive impact on the efficiency of technological innovation through a spillover effect and mutual "hitchhike" [41][42][43]. This paper selects an entropy index to measure high-tech industries agglomeration. Suppose that A is the total output of a certain province's high-tech industries sector, and A i is the output of the high-tech industries of the i province. We then get The entropy index of high-tech industries agglomeration can be calculated by the (H ≥ 0). If A 1 = A 2 = · · · = A n , then P 1 = P 2 = · · · = P n , which means that the distribution of this province's high-tech industries area is in equilibrium, the professional level is the lowest, and H reaches the maxim value of log N.
Outward economy (OE). Numerous research studies show that the higher the opening degree of an area, the greater the external trade and investment, and the greater the area's potential for technological innovation. This paper selects the proportion of foreign investment in the total investment as a main indicator of a province's economic openness.
Developed degree of modern service industries (SI). Modern service industries, such as finance, intermediary services, and information, are the foundation and guarantee of technological innovation. Developed modern service industries can effectively reduce the cost of high-tech industries innovation and improve the efficiency of technological innovation. This paper selects the proportion of modern service industries in the whole of service industries to measure the developed degree of modern service industries.

Model Assignment
From the viewpoint of Anselin [44], a certain area's economic characteristics are not isolated, but related to the characteristics of the adjacent areas-namely, distinct spatial correlation characteristics. If there is spatial heterogeneity or spatial correlation among the cross section data, then the linear regression model may deviate in the analysis of the correlation between the independent variables and the dependent variables. This paper considers that the spillover effect of innovation activities is evident, i.e., a province's high-tech industries' innovation efficiency does affect the surrounding provinces. Therefore, the spatial effect should be regarded as the premise of the analysis on the influencing factors of China's high-tech industries' innovation efficiency.
Spatial statistics use the spatial autocorrelation index Moran s I to test the existence of spatial correlations. This paper employs GEODA to test the spatial correlation of China's high-tech industries' innovation efficiency from 1999 to 2018. For most years, the normal statistics Z value of Moran s I exceeds the critical value of 5% (as shown in Table 2), which shows an obvious dependence the high-tech industries' innovation efficiency on their spatial distribution. As a result of the spatial dependence of the high-tech industries' innovation efficiency, the traditional linear regression model may deviate when used to analyze the influencing factors of such innovation efficiency. Anselin pointed out two methods to solve spatial autocorrelation [44]. One is the Spatial Autoregressive Model (SAR), by adding weighting endogenous variables to the model; the other is the Spatial Error Model (SEM), by adding spatial error terms to the model. This paper selects SAR to analyze the influencing factors of China's high-tech industries' innovation efficiency. The metering model is as follows: Here, E represents efficiency; RS, II, IA, OE, and SI respectively represent government support, R&D input intensity, high-tech industries agglomeration, outward economy, and the developed degree of modern service industries; ρ is a spatial lag coefficient; and W is the spatial weight matrix.
China's high-tech industries' innovation efficiency includes technology development efficiency, technology conversion efficiency, and holistic innovation efficiency. To compare the effect of those influencing factors on these three kinds of efficiency, this paper presents a metering analysis of the relationship between the three kinds of efficiency and those influencing factors.

Analysis of Empirical Results
To make a comparison, this paper uses Ordinary Least Squares (OLS) and SAR to analyze the influencing factors of China's high-tech industries' innovation efficiency. Considering the regional individual differences and the possible deviations of the time factors in the results, we used the time and individual two-way fixed effect model to estimate the parameters while making the comparison. The results are as follows (Table 3). The estimated results of OLS and SAR show that the spatial metering model's goodness-of-fit with regard to technological development efficiency, technological conversion efficiency, and holistic innovation efficiency is superior to the OLS estimation, which demonstrates the spatial correlation of China's high-tech industries' innovation efficiency. The spatial auto-regression coefficients ρ of technological development efficiency, technological conversion, and holistic innovation efficiency are respectively 0.113, 0.108, and 0.120, all exceeding the significant level. It implies a positive spatial dependence on the innovation efficiency of the neighboring provinces' high-tech industries.
The estimated results of the influencing factors of the high-tech industries' innovation efficiency show that the influence of government support, R&D input intensity, and industries agglomeration on technological development efficiency passes the significance test, and the influence coefficients are respectively 0.273, 0.148, 0.209, and 0.106, while the developed degree of modern service industries does not pass the significance test. The influence of industries agglomeration and the developed degree of modern service industries on technological conversion efficiency passes the significance test, and the influence coefficients are respectively 0.128 and 0.235, while other factors do not pass the significance test. The influence of R&D input intensity, industries agglomeration, outward economy, and the developed degree of modern service industries on holistic innovation efficiency passes the significance test, and the influence coefficients are respectively 0.129, 0.171, 0.139, and 0.228. Therefore, different factors differ in their impact on technological development efficiency, technological conversion efficiency, and holistic innovation efficiency, and government support effectively improves technological development efficiency, but do not lead to outstanding improvement in technological conversion efficiency or holistic innovation efficiency. The improvement of R&D input intensity helps accelerate technological development efficiency and holistic innovation efficiency, but not technological conversion efficiency. Industries agglomeration has an impact on three kinds of efficiency: the biggest on technological development efficiency and the smallest on technological conversion efficiency. Outward economy has a positive effect on technological development and holistic innovation efficiency, but is not conducive to technological conversion efficiency. The developed degree of modern service industries does not seem to affect technological development efficiency.
The empirical findings indicate that R&D input intensity, industries agglomeration, outward economy, and the developed degree of modern service industries can improve the high-tech industries' innovation efficiency and holistic innovation efficiency due to their influence on technological development and conversion. If we ignore the two-stage structure of the high-tech industries' innovation efficiency, we are unable to understand how these factors affect innovation efficiency through their impact on technological development and conversion, which is crucial to the promotion of holistic innovation efficiency.

Conclusions
This paper establishes a shared inputs two-stage network DEA model to estimate the technological development efficiency and the holistic innovation efficiency of high-tech industries in different Chinese provinces from 1999 to 2018, and analyzes the influencing factors of the innovation efficiency of the high-tech industries of these provinces with a spatial metering model. The results are as follows: (1) There is an apparent regional difference in the high-tech industries' technological development efficiency, technological conversion efficiency, and holistic innovation efficiency, and the three kinds of efficiency are remarkably higher in the developed provinces of the eastern coast than in the central and western provinces, which are poorer. (2) Judging from the comparison, technological development efficiency in backward provinces is much higher than holistic innovation efficiency, which is greater than technological conversion efficiency; in developed provinces, technological conversion efficiency is usually higher than holistic innovation efficiency, which is higher than technological development efficiency. (3) Government support can effectively promote technological development efficiency, but not technological conversion efficiency or holistic innovation efficiency; R&D input intensity helps accelerate technological development efficiency and holistic innovation efficiency, but is not outstanding in improving technological conversion efficiency. (4) Industries agglomeration has an impact on three kinds of efficiency: the biggest on technological development efficiency and the smallest on technological conversion efficiency. (5) Outward economy has a positive effect on technological development and holistic innovation efficiency, but is not conducive to technological conversion efficiency. (6) The developed degree of modern service industries does not seem to affect technological development efficiency.
Based on these conclusions, the Chinese government should support and encourage high-tech industrial innovation. Firstly, the promotion of high-tech industrial innovation, including technological development and conversion, is a complex course to take for any country. Therefore, to improve the high-tech industries' innovation efficiency, attention must be paid to technological development efficiency and technological conversion efficiency. For example, the high-tech industries' technological development efficiency in Shaanxi is at the front of national rankings, but holistic innovation efficiency is not high due to a relatively low technological conversion efficiency. Secondly, China should help promote the technological strengths and technological spillover effects of the provinces whose high-tech industries have a higher innovation efficiency, such as Beijing, Shanghai, Guangdong, and Jiangsu, in order to help enhance the innovation efficiency of the surrounding and poorer provinces. Thirdly and finally, according to the differences in the three kinds of efficiency among all provinces, factors such as industries agglomeration, R&D input intensity, and outward economy should be taken into consideration when executing different policies.
We proposed some measures to mitigate regional differences, to be carried out by the Chinese government: regional governments should (1) continue to increase support for high-tech industries and promote guidance and coordination policies; (2) pay attention to R&D investment and human resource advantages, and promote the development of high technologies, to lay the foundation for sustainable development; (3) strengthen the flow of innovative resources between provinces, actively introduce advanced technologies, and achieve the integration and development of high technologies and complementary resources; (4) accelerate market-oriented reforms and institutional innovations in the central and western regions, promote regional technology diffusion, improve the efficiency of regional resource allocation, and gradually realize the convergence of innovation efficiency in various regions, thereby increasing the level of innovation efficiency in backward areas.