Evaluation Model and Empirical Research on the Green Innovation Capability of Manufacturing Enterprises from the Perspective of Ecological Niche

Green innovation is an important driving force in promoting the sustainable development of manufacturing enterprises and improving market competitiveness. This study selects indicators from the two aspects of ecostate and ecorole in order to reflect green research and development, cleaner production, and green marketing based on niche theory. We construct an evaluation index system to objectively and accurately assess the green innovation capability of manufacturing enterprises. Subsequently, based on the principle of relative entropy, the analytic hierarchy process, entropy weight method, and coefficient of variation method are fused to determine the combined weight of the indicators, and a multi-level, comprehensive evaluation model is constructed using cloud model tools. Finally, through an empirical analysis of the evaluation of the green innovation capability of five manufacturing enterprises, the feasibility of the model and the stability of the evaluation results are verified through three dimensions: numerical experiment, sensitivity analysis, and method comparison. The results show that the evaluation system constructed in this study is superior. It provides the basis and decision-making reference for enterprises to carry out market positioning and formulate innovation and development strategies.


Introduction
With the deterioration of the global environment, manufacturing enterprises that depend on resource consumption have realized that the extensive development model will end. Seeking a "harmonious coexistence" between enterprises and the environment has become a global problem [1]. "Made in China 2025" indicates that green innovation is the key to upgrading manufacturing and achieving high-quality development [2]. In the context of the vigorous development of global green technology and the business environment, green innovation is also an important way for Chinese enterprises to participate in international competition and establish a sustainable competitive advantage [3]. Therefore, the systematic analysis and scientific evaluation of the green innovation ability of enterprises can help to promote the effective diffusion of green innovation [4]. This has important theoretical value and practical significance for improving the level of green innovation of enterprises and realizing sustainable social development.
Niche theory explains the competition between organisms and their adaptability to the environment; it also describes the most suitable living position for organisms in the eco-system [5]. The enterprise niche is the link between its survival, development, and living environment, representing the enterprise's competitiveness [6]. In recent years, the differential impact of ecological niche on different forms of technological innovation has become a research hotspot. Combined with the development of green innovation in manufacturing enterprises, this study identifies factors influencing the ecostate and ecorole of enterprises' green innovation from the perspective of ecological niche and constructs an Others have constructed an evaluation index system based on economic, environmental, and social (EES) elements [25][26][27]. For example, the triple bottom line theory believes that practitioners should be encouraged to evaluate the level of innovation development from the economic impact and the social and environmental impacts [28]. Chan et al. established an industrial sustainability assessment of China's capital economic circle by integrating EES factors and used the principal global component analysis method to evaluate the industrial performance of various regions [29]. Economic performance is mainly reflected by the total number of new products, market share, and other indicators. The comprehensive utilization rate of the three wastes and carbon emission intensity are often used to measure environmental performance. The EES comprehensive development perspective indicates the economic, environmental, and social benefits of green innovation from a macro perspective.
Common measurement methods include data envelopment analysis (DEA) [30,31], the fuzzy comprehensive evaluation method, factor analysis [32], principal component analysis [33], analytic hierarchy process (AHP), entropy weight, technique for order preference by similarity to ideal solution (TOPSIS), and grey correlation analysis. For example, Li et al. [34] analyzed regional innovation and green economy efficiency based on DEA and fuzzy evaluation methods. Musaad et al. [35] used AHP to calculate the index weight and used the TOPSIS grey technology to rank the green innovation capability of suppliers. Zhang et al. [36] used the entropy weight method to evaluate the quality of regional green innovation and built an index system with three aspects: the technical, economic, and ecological benefits of innovation activities. Qiu et al. [37] introduced the coefficient of variation and hierarchical model to determine the evaluation weight, and used the grey multi-level evaluation method to measure the green level of four representative eco-industrial parks.

Niche Theory
Grinnell [38] proposed the idea of niche, which is interpreted as the comprehensive composition of the population and its environmental space (living space and resource space). Niche situation theory holds that organisms include two dimensions: ecostates and ecoroles. Ecostate is interpreted as the result of past learning, social, and economic development, and the interaction with many environmental factors; ecorole is the ability to influence and dominate the environment [39]. Innovation activities have similar laws and characteristics to organisms, and their niche situation is a process of dynamic selection, which is adjusted with the change in comprehensive ability and the change of interactive relationship with the external environment [40].
Niche theory is often used to analyze the competitiveness and potential of enterprises. Wan analyzed niche for viability, development, and competitiveness and established a comprehensive ecological niche evaluation method based on production and manufacturing capacity, core technology capacity, and marketing management capacity [41]. Yan designed an index system for enterprise niche evaluation using two aspects: the ecostate and ecorole of niche, with the results capable of reflecting enterprises' competitive potential and viability [42]. He et al. [43] believe that niche situation represents the existing ability and future development potential of enterprises; they demonstrate that the situation has a significant positive impact on cross-organizational and technological collaborative innovation. Meng et al. [44] used an extended logistic model to analyze the ecological niche of organizational open innovation capability and proposed the path for enterprise innovation development.
Some scholars apply niche theory to analyze the process of the industrial evolution and the relationship between industry and the environment. Greve et al. [45] found that learning contributes to ecological niche change in the insurance industry, and organizational growth comes from learning reflection on a failed economy. Bakker et al. [46] dis-cussed how battery vehicles and hydrogen vehicles that were developed with independent innovation modes could adapt to future market selection standards using a technology niche strategy. Sanderson et al. [47] tracked the niche evolution of the solid-state lighting industry by analyzing the technological changes in light-emitting diodes (LED). Referring to the niche Sustainability 2021, 13, 11710 4 of 21 construction theory, Smith et al. [48] proposed that innovation or technological progress should be evaluated under the framework of whether it is conducive to sustainable socioeconomic development. Generally speaking, scholars mainly study the characteristic relationship between industry and biological systems from the industrial level, and regard industry as a part of biological system.

Brief Review
To sum up, many scholars have conducted rich research on niche theory and green innovation, but there are also deficiencies, as shown in Table 1.

Green innovation
Index system Innovation process [12][13][14] Relevant studies mainly focus on exploring one or two types of green innovation (technology, production, or marketing), and lack the combination of key indicators, including the whole process of innovation.
Inputs and outputs [18][19][20] Scholars mainly focus on the green innovation model, efficiency, and methods at the regional or industrial level, and few studies analyze the green innovation ability of enterprises based on the niche theory.

Niche theory Application
Enterprise niche [41][42][43] Scholars focus on the qualitative analysis of enterprise niche and the relationship between industrial niche and the environment while paying less attention to the quantitative analysis of niche theory from the perspective of micro-innovation subjects.
Industrial niche [45][46][47][48] Based on this, drawing on the niche situation theory and the connotation of green innovation, this paper selects the key indicators affecting the green innovation ability of enterprises from the perspectives of R&D, production, and marketing, and constructs an evaluation index system of green innovation ability from the perspective of niche. The index weight is obtained by using the principle of relative entropy and by comprehensively considering AHP [49], entropy [50] and coefficient of variation [51]. Simultaneously, we use the advantages of a cloud model [52] in the transformation of uncertainty to evaluate and study green innovation ability. Finally, through empirical analysis, the feasibility of the model is verified through the employment of a numerical experiment, sensitivity analysis, and method comparison. This method provides a scientific basis for the evaluation standard of enterprise green innovation and the optimization path of enterprise green innovation.

Constructing the Index System
The construction of a green innovation capability evaluation index system for manufacturing enterprises from the ecological niche perspective follows systematization, scientificity, operability, and quantification [53]. This study constructs an index system according to the following steps: First, according to the definition of green innovation and niche theory and literature, the audition indicator is determined; second, the method of expert screening is used to delete the indicators that have little impact on the evaluation results; third, delete the indicators with high correlation in the same criterion layer through correlation analysis; finally, the non-key indicators that have no impact on the ranking are eliminated through discrimination analysis. Two first-level indicators and 13 secondary-level indicators were obtained. The following are the specific meanings and contents of the indicators, while the final index system constructed in this study is presented in Table 2 [54]: (1) The ecostate of niche is the status of enterprises' green innovation ability, reflecting the accumulation of resources such as green innovation personnel and capital investment, mainly green R&D, cleaner production, and green marketing. Green R&D is mainly composed of the proportion of R&D personnel, R&D capital investment intensity, and the number of scientific research platforms. Cleaner production mainly comprises environ-mental management investment intensity, technological transformation investment intensity, production personnel proportion, and personnel quality. Green marketing includes three waste emissions per unit profit, energy consumption per unit profit, and patent quality.
(2) The ecorole of niche mainly reflects the development trend of enterprise green innovation activities and is a dominant force in sustainable innovation. This includes the market share growth rate, enterprise profit growth rate, and patent growth rate.

Index Weight
To measure the importance of each index, we used the relative entropy combination weighting method to determine the weight of each index, which can improve the compatibility of multiple single-weighting methods and reflects the essential characteristics of complex systems such as nonlinearity and emergence.

Single-Weighting Methods
The AHP is a subjective weighting method, and its specific steps are as follows: (1) Construct the comparison judgment matrix A = (a ij ) n×n , where a ij = x i /x j ,a ij is the relative importance of the i-th index and the j-th index, the selection of x i and x j refers to the Saaty scale, and n is the number of indicators.
(2) Calculate the maximum eigenvalue λ max of A, and its corresponding eigenvector is the required weight vector W = [w 1 , w 2 , . . . w n ] T .
(3) Consistency inspection. Solve the consistency ratio CR = CI/RI, CI = (λ max − n)/ (n − 1) is the consistency index, and RI is the consistency random index. If CR < 0.1, it is considered to meet the requirements, otherwise it needs to be reassessed.
The characteristic of the entropy weight method [60] is that the higher the order degree of an index, the lower the information entropy and the greater the index weight. The specific steps are as follows: (1) Standardized treatment of the evaluation value is as follows: (2) Calculate the entropy H j of the j-th evaluation index as follows: (3) Calculate the entropy weight w j of the j-th index as follows: The coefficient of variation (CV) is a method of determining the index weight by using the variation degree of the evaluated index. The specific calculation steps are as follows: (1) Calculate the coefficient of variation v j of the j-th index as follows: where x ij (i = 1, 2, . . . , m; j = 1, 2, . . . , n) represents the value of the j-th index of the evaluation object i, and x j is the average value of the j-th index.
(2) Calculate the weight w j of the j-th index as follows:

Combined Weighting Method Based on the Relative Entropy Principle
Relative entropy [61,62] is used in information theory and probability theory to describe the difference between two probability distributions. The purpose of using a combined weighting method based on the relative entropy principle is to minimize the sum of the relative entropy between the combined weight and each single weighting method. The calculation steps are as follows: (1) Let the aggregation weight of AHP, entropy, and CV method be b = (b 1 , b 2 , . . . , b m ), and y ij (i = 1, 2, . . . , n; j = 1, 2, . . . m) is the weight of the j-th index of the i-th single weighting method, then establish the mathematical optimization model according to relative entropy. The calculation formula is as follows: (2) Calculate the weight distribution coefficient β i according to the following formula: where h(y i , b) is the relative entropy of single weight y i relative to aggregation weight b, and the calculation formula is as follows: Sustainability 2021, 13, 11710 7 of 21 (3) The calculation formula of combined weight W j is as follows:

Green Innovation Capability Evaluation Model
The green innovation capability of manufacturing enterprises from the perspective of ecological niche is a comprehensive concept. It is necessary to express and deal with the fuzzy concept to establish an accurate and comprehensive ecological niche index evaluation system. The cloud model is based on fuzzy mathematics theory and probability theory. It can establish the mapping relationship between qualitative and quantitative data and realize the transformation of qualitative and quantitative data. Thus, the effective information of the qualitative expression is extracted, and the qualitative operation is processed according to the algorithm. Additionally, the scope and distribution of quantitative data are intuitive and accurate expressions of natural language, with strong interpretability.

Standardization of Index System
Owing to the different dimensions of evaluation indicators, the indicators are standardized as follows: Negative indicator : where P ij is the standardized value of the j-th index of the evaluation object A i , and A ij is its original data.

Establish the Cloud Model of Each Index
Among the evaluation indicators of green innovation capability of enterprises, there are both accurate values and fuzzy language values. The cloud model representation methods are different [63], as follows: (1) Cloud model representation method for the accurate numerical description indicator: (2) Cloud model representation of the language value description index. The domain of discourse corresponding to the comment set is expressed as [0,1], and each comment in the comment set corresponds to an interval of a domain. In this study, the comment set C is divided into five, that is, C = {Worst, Poor, Medium, Good, Excellent}. For the intermediate interval, select the bilateral constraint [V min , V max ], and the endpoint selects the semi-cloud model for representation. The change intervals corresponding to this comment are shown in Table 3. The comment representation of the symmetric cloud is calculated as follows [64]: The larger the known ecological niche value, the stronger the niche of green enterprise innovation, and the higher the development level of green innovation. The greater the interaction with the environment, the greater the impact on the environment and the higher the utilization rate of enterprise resources. If the niche level of green innovation is low, the role of green innovation in enterprise development is limited, and the utilization rate and advantage of innovation resources are not high. The niche situation of green innovation is a dynamic selection process, which changes with the change in its comprehensive ability and its interactive relationship with the external environment. The comments are transformed into a cloud model according to the formula above, and the expected value constitutes the decision matrix D. The algorithm steps for calculating the numerical characteristics of the one-dimensional cloud model corresponding to each index are as follows [65]: (1) Input the n cloud droplets x i (i = 1, 2, . . . , n); (2) Calculate the sample mean X = 1 n n ∑ i=1 x i according to x i ; (3) Calculate the expectation: Ex = X; (4) Calculate the entropy: (5) Calculate the sample variance: (6) Calculate the hyper entropy: Output the numerical characteristics (Ex, En, He). If there are n adjacent cloud models in the evaluation index system, the numerical characteristics of the comprehensive cloud model of n cloud models are as follows [66]:

Evaluation Model
The specific steps of the green innovation capability evaluation model for manufacturing enterprises from the perspective of the ecological niche are as follows: (1) Construct an index system based on niche situation theory and collect data; (2) Data standardization processing; (3) The index combination weight is determined based on the principle of relative entropy; (4) Calculate the evaluation value of enterprise green innovation capability according to the multilevel comprehensive cloud model algorithm; (5) The sensitivity analysis of criteria weight is carried out for the evaluation method, and the flow of the model is shown in Figure 1.
(2) Data standardization processing; (3) The index combination weight is determined based on the principle of relative entropy; (4) Calculate the evaluation value of enterprise green innovation capability according to the multilevel comprehensive cloud model algorithm; (5) The sensitivity analysis of criteria weight is carried out for the evaluation method, and the flow of the model is shown in Figure 1.

Data Collection
This study selected five representative home appliance manufacturing enterprises from the list of green manufacturing enterprises published by the Ministry of Industry and Information Technology of China to verify that the above framework accurately and effectively reflects the green innovation ability of manufacturing enterprises in the actual

Data Collection
This study selected five representative home appliance manufacturing enterprises from the list of green manufacturing enterprises published by the Ministry of Industry and Information Technology of China to verify that the above framework accurately and effectively reflects the green innovation ability of manufacturing enterprises in the actual decision-making environment. The data analyzed were from the 2018 and 2019 Corporate Social Responsibility Reports, Annual Reports, Environmental Reports, Sinofin Database, and State Intellectual Property Office Network.

Standardization of Index System and Weight Distribution
Anonymous enterprises are represented by the letters A-E. According to the index system established in Table 1, the data are standardized by Formulas (14) and (15), as shown in Table 4. The qualitative and quantitative index data are collected according to the constructed index system, and the index weight is determined by the combined weighting method of relative entropy. Taking the indicator of the ecostate level as an example, the weight is first calculated by a single-weighting method. Let the weight determined by the AHP be y 1 .

Determine the Comprehensive Evaluation Cloud Model
The green innovation ability of five enterprises is evaluated by using the constructed index system. According to the comments set in Table 2, the data of each index in Table 3 are transformed into the corresponding comment language values (the Worst, Poor, Medium, Good, and Excellent are replaced by their initials W, P, M, G, and E, respectively), as shown in Table 6.
Convert the qualitative language value of each index in Table 5 into a quantitative value, and the expected value of comments into decision matrix D:   According to the indicator analysis of a multi-level comprehensive cloud, the adjacent indicator cloud is comprehensively calculated using Formula (14). For example, the expectation, entropy, and hyper entropy of the C1 indicator cloud model are calculated as follows: Therefore, the comprehensive cloud of green innovation capability from the perspective of the ecological niche is (0.4378, 0.4004, 0.1289).
According to the calculation formula of the cloud model, the numerical characteristics of the ecostate dimension of enterprise A's green innovation ability are as follows: Similarly, the numerical characteristics of the ecostate and ecorole of the ecological niche of other enterprises' green innovation capability are calculated, as shown in Table 8. Similarly, the numerical characteristics of the green innovation capability of other enterprises are shown in Table 9.

Result Analysis and Discussion
First, this section expounds on the overall ecological situation of green innovation based on the sample enterprises by analyzing the ecostate and ecorole of the ecological niche of the green innovation capability of five enterprises. Then, the ecological status of the green innovation capability of different enterprises is calculated. Finally, the methods are compared and analyzed to verify the accuracy of the evaluation results, and a weight sensitivity analysis is carried out to verify the robustness and stability of the decisionmaking method.

Analysis of Influencing Factors of Green Innovation Capability
By analyzing the components of ecostate and ecorole, the factors affecting the overall green innovation capability of the sample enterprises are intuitively displayed, and the expectation in Table 6 is drawn as a histogram, as shown in Figure 2.
As can be seen from Figure 3, the ecostate of green R&D is at the "general" level, in which the value of the number of scientific research platforms is lower than other indicators. The number of scientific research platforms reflects the enterprise's attitude and support of green innovation activities and determines the level of green enterprise innovation investment. Dynamic capability theory holds that to obtain good performance output, enterprises need to creatively integrate multi-party resources and capabilities, promote industry-university-research cooperation and improve the output efficiency of innovation. The ecostate level of environmental management investment in cleaner production is "general." The government should increase environmental regulation and provide subsidies to promote green innovation, optimize raw material investment, improve production technology, and strengthen the implementation of cleaner production. However, the value of the "three waste emissions per unit profit" is low, while other green marketing indicators are medium. This shows that the overall green innovation marketing of sample enterprises needs to be strengthened. The realization degree of green innovation achievements depends on the market acceptance degree, and ecological marketing can significantly improve the market acceptance degree of technological innovation achievements. The national 13th five-year plan proposes to strengthen the pace of resource conservation and environmental protection, carry out green R&D, cleaner production and green marketing, and promote the sustainable development of the manufacturing industry. At present, the green innovation of manufacturing enterprises has not yet created a scale effect, and the awareness of environmental protection and resource utilization are also low.

Result Analysis and Discussion
First, this section expounds on the overall ecological situation of green innovation based on the sample enterprises by analyzing the ecostate and ecorole of the ecological niche of the green innovation capability of five enterprises. Then, the ecological status of the green innovation capability of different enterprises is calculated. Finally, the methods are compared and analyzed to verify the accuracy of the evaluation results, and a weight sensitivity analysis is carried out to verify the robustness and stability of the decisionmaking method.

Analysis of Influencing Factors of Green Innovation Capability
By analyzing the components of ecostate and ecorole, the factors affecting the overall green innovation capability of the sample enterprises are intuitively displayed, and the expectation in Table 6 is drawn as a histogram, as shown in Figure 2. As can be seen from Figure 3, the ecostate of green R&D is at the "general" level, in which the value of the number of scientific research platforms is lower than other indicators. The number of scientific research platforms reflects the enterprise's attitude and support of green innovation activities and determines the level of green enterprise innovation investment. Dynamic capability theory holds that to obtain good performance output, enterprises need to creatively integrate multi-party resources and capabilities, promote industry-university-research cooperation and improve the output efficiency of innovation. The ecostate level of environmental management investment in cleaner production is "general." The government should increase environmental regulation and provide subsidies to promote green innovation, optimize raw material investment, improve production technology, and strengthen the implementation of cleaner production. However, the value of the "three waste emissions per unit profit" is low, while other green marketing indicators are medium. This shows that the overall green innovation marketing of sample enterprises needs to be strengthened. The realization degree of green innovation achievements depends on the market acceptance degree, and ecological marketing can significantly improve the market acceptance degree of technological innovation achievements. The national 13th five-year plan proposes to strengthen the pace of resource conservation and environmental protection, carry out green R&D, cleaner production and green marketing, and promote the sustainable development of the manufacturing industry. At present, the green innovation of manufacturing enterprises has not yet created a scale effect, and the awareness of environmental protection and resource utilization are also low. As for the dimension of ecorole, the levels of profit growth rate and patent application growth rate are "poor." The government needs to take control and implement market-incentive environmental regulations to affect the green innovation behavior of enterprises. This will encourage enterprises to increase resource investment, improve the transformation efficiency of green R&D, and convert patents into products that can obtain market profits. Overall, the market share of the sample enterprises has a large room for growth. This is compatible with China's current industrial structure adjustment, forcing the closure of highly polluting factories, promoting the greening of production services, and implementing the green transformation and upgrading of manufacturing enterprises. Additionally, while pursuing economic benefits through green innovation, enterprises also publicize the innovative concept of protecting the ecological environment, which will win the favor and recognition of consumers.

Evaluation Results of the Green Innovation Capability of Different Enterprises
To more intuitively display the ecostate, ecorole, and comprehensive ecological niche value of the green innovation capacity of the five enterprises, combined with the numerical characteristics of the cloud in Tables 7 and 8, MATLAB programming was used to run the forward cloud generator in order to generate the corresponding cloud images contain- As for the dimension of ecorole, the levels of profit growth rate and patent application growth rate are "poor." The government needs to take control and implement market-incentive environmental regulations to affect the green innovation behavior of enterprises. This will encourage enterprises to increase resource investment, improve the transformation efficiency of green R&D, and convert patents into products that can obtain market profits. Overall, the market share of the sample enterprises has a large room for growth. This is compatible with China's current industrial structure adjustment, forcing the closure of highly polluting factories, promoting the greening of production services, and implementing the green transformation and upgrading of manufacturing enterprises. Additionally, while pursuing economic benefits through green innovation, enterprises also publicize the innovative concept of protecting the ecological environment, which will win the favor and recognition of consumers.

Evaluation Results of the Green Innovation Capability of Different Enterprises
To more intuitively display the ecostate, ecorole, and comprehensive ecological niche value of the green innovation capacity of the five enterprises, combined with the numerical characteristics of the cloud in Tables 7 and 8, MATLAB programming was used to run the forward cloud generator in order to generate the corresponding cloud images containing 1600 cloud droplets, as shown in  As shown in Figure 3, the order of the ecostate values of the green innovation capability of different enterprises is A > C > D > E > B. The ecostate value of Enterprise B's green innovation capability is the lowest. From the analysis, it can be concluded that the R&D investment intensity in green R&D, the number of scientific research platforms, and the energy consumption per unit profit in the end treatment have become the main factors affecting the low level of green innovation. Green innovation requires more complex and diversified knowledge and skills. Enterprise B needs to creatively integrate multiple resources and capabilities, increase R&D investment, increase cooperation with scientific research institutes and universities, and have the opportunity to promote industry-university research cooperation. It also needs to obtain diversified and complementary knowledge and other R&D resources externally so as to realize high-level green innovation. Simultaneously, an improvement of the production process and the reduction of energy consumption are required.
It can be seen from Figure 4 that the order of ecorole values of the green innovation capability of different enterprises is C > D > B > A > E. The direct reason for the worst ranking of enterprise E is that it is affected by profit growth rate and patent application growth rate; the deeper reason is that its green R&D investment intensity is poor, so the growth rate of patent application is low and the achievement conversion rate is also low, resulting in the low profit growth rate of the enterprise. Enterprises in emerging economies have the advantage of backwardness in global green innovation and progress. Enterprise E needs to increase green R&D investment, such as what Huawei, Haier, and TCL have accomplished, to obtain advanced technology and knowledge and improve the patent application rate, so as to improve the achievement conversion rate. Simultaneously, the green production behavior of enterprises can significantly improve the organizational ability, including the coordination ability of stakeholders, higher learning ability, and sustainable innovation ability, which can bring more market benefits to enterprises. growth rate; the deeper reason is that its green R&D investment intensity is poor, so the growth rate of patent application is low and the achievement conversion rate is also low, resulting in the low profit growth rate of the enterprise. Enterprises in emerging economies have the advantage of backwardness in global green innovation and progress. Enterprise E needs to increase green R&D investment, such as what Huawei, Haier, and TCL have accomplished, to obtain advanced technology and knowledge and improve the patent application rate, so as to improve the achievement conversion rate. Simultaneously, the green production behavior of enterprises can significantly improve the organizational ability, including the coordination ability of stakeholders, higher learning ability, and sustainable innovation ability, which can bring more market benefits to enterprises. It can be seen from Figure 5 that the order of the comprehensive niche value of the green innovation capability of different enterprises is C > D > A > B > E. Enterprise C only has a small number of scientific research platforms, so it needs to strengthen its construction of scientific research platforms, strengthen cooperation with universities and research institutes, and improve its capacity for green innovation according to the actual needs of the market. According to the figure above, the comprehensive ecological niche value of Enterprise A ranks third. The direct factor affecting its ranking is the low level of ecorole, and the deep-seated reasons include: first, the large investment in green R&D and cleaner production slows down the growth rate and delays the benefit period; second, the dynamic capacity of enterprise knowledge resources only stays at the acquisition level and does not form an effective core competence. The enterprise is the main body of  It can be seen from Figure 5 that the order of the comprehensive niche value of the green innovation capability of different enterprises is C > D > A > B > E. Enterprise C only has a small number of scientific research platforms, so it needs to strengthen its construction of scientific research platforms, strengthen cooperation with universities and research institutes, and improve its capacity for green innovation according to the actual needs of the market. According to the figure above, the comprehensive ecological niche value of Enterprise A ranks third. The direct factor affecting its ranking is the low level of ecorole, and the deep-seated reasons include: first, the large investment in green R&D and cleaner production slows down the growth rate and delays the benefit period; second, the dynamic capacity of enterprise knowledge resources only stays at the acquisition level and does not form an effective core competence. The enterprise is the main body of knowledge, and the basic role of the organization is to acquire, absorb, and use knowledge. Enterprise C needs to enhance the absorption capacity within the organization and improve the output efficiency of green innovation. In view of the low comprehensive ecological niche value of Enterprise B, it is suggested that the enterprise should increase its investment intensity in green R&D and cleaner production, shut down highly polluting plants, improve awareness of protecting the ecological environment, and improve their strategic position of resource utilization. In view of the low niche level of Enterprise B, it is suggested that the enterprise must increase its investment intensity in green R&D and cleaner production. The implementation of cleaner production will improve the performance of enterprises, not only the direct financial performance, but also the internal operation status and external market environment of the enterprise. The enterprise is also advised to shut down highly polluting plants, improve their awareness of protecting the ecological environment, and improve their strategic position of resource utilization. A characteristic of emerging markets is the existence of institutional gaps, which may lead to lack of law enforcement, corruption, transaction uncertainty, and market instability. The government will have to effectively fill these institutional gaps by formulating and implementing environmental regulations in order to lead enterprises to choose green innovation strategies.

Weight Sensitivity Analysis Framework
In this study, the one-at-a-time (OAT) [67] was used to test the sensitivity of the weight indicator. Through sensitivity analysis, it could be determined that the potential change in the evaluation criteria weight would lead to a deviation in the decision results, which is the key to the effective use of the model and the implementation of quantitative decision making. The specific steps are as follows [68]: (1) Calculate weights. Set the range and step size of specific weight change to  30% and  2% [69], and the new adjustment weight of sensitivity is calculated using the following formula: where () j w cr is the specific weight change; cr is the change rate of weight; j w is the original weight of the j-th index. The calculation formula of other weights is as follows: where () i w cr is other weight adjusted by j w , i.e., ij  and i w is the initial weight of the i-th index.

Weight Sensitivity Analysis Framework
In this study, the one-at-a-time (OAT) [67] was used to test the sensitivity of the weight indicator. Through sensitivity analysis, it could be determined that the potential change in the evaluation criteria weight would lead to a deviation in the decision results, which is the key to the effective use of the model and the implementation of quantitative decision making. The specific steps are as follows [68]: (1) Calculate weights. Set the range and step size of specific weight change to ±30% and ±2% [69], and the new adjustment weight of sensitivity is calculated using the following formula: w j (cr) = (1 + cr) × w j (16) where w j (cr) is the specific weight change; cr is the change rate of weight; w j is the original weight of the j-th index. The calculation formula of other weights is as follows: where w i (cr) is other weight adjusted by w j , i.e., i = j and w i is the initial weight of the i-th index.
(2) As a traditional statistical method, the mean of the absolute change rate (MACR) can summarize the sensitive results based on the uncertainty of input parameters and display the uncertainty of evaluation results. Therefore, this study uses MACR [70] to calculate the overall index sensitivity of the sample, and the calculation formula is as follows: where MACR(w j (cr) is the mean of absolute change rate of w j (cr); with the change of w j (cr), the evaluation value of the k-th evaluation object is R k (w j (cr)); R 0 is the initial evaluation value. The higher the MACR value, the higher the sensitivity. Select representative indicators: the number of scientific research platforms and the patent application growth rate as specific weights; the weight change rates are 10%, 20%, and ±30%. The expectation of the cloud model of the green innovation capability of different enterprises are shown in Table 10. Table 10. Sensitivity analysis of the green innovation capability evaluation of different enterprises. It can be seen from Table 9 that the expectation of E is the smallest and that of C is the largest in the experiment, and the ranking of innovation capability is the same. When the weight change rate is −30%, A ranks fourth (in other cases, it ranks third), and A is more sensitive to C23 than other enterprises. In conclusion, the decision-making method in this study is relatively insensitive to changes in weight.

First-Level Indicators
When the weight of each indicator changes from −30% to +30% and the step is 2%, the mean of the absolute change rate of the evaluation results of enterprise green innovation capability is summarized by MACR according to the change in weight (Figures 6 and 7).
It can be seen from Figures 6 and 7 that the MACR value increases linearly with the change rate of weight, but there are different gradients for different indicators. The MACR values of the same indicator are almost equal, with the same absolute change rate but with positive and negative values, indicating that the sensitivity to the changes in positive and negative weights is similar. The higher the gradient, the greater the change in the green innovation capability evaluation value with the weight change, and the higher the indicator's sensitivity. The MACR ranking of each indicator follows the order of weight. Taking the 30% change rate as an example, C12 and C23 are the most sensitive indicators of weight change, and their MACR values are equal to 2.1267% and 6.0972%, respectively, whereas C16 and C21 are the least sensitive indicators, and their MACRs are only 0.1358% and 2.0705%, respectively. The MACR of the simulation results is significantly lower than the change rate of weight, indicating that the evaluation results are relatively robust. The MACRs provide information on the numerical changes in the evaluation values of green innovation capability, indicating the sensitivity of indicators associated with the size of the weights for different indicators. This result is consistent with that of a previous study [70]. and 2.0705%, respectively. The MACR of the simulation results is significantly lower than the change rate of weight, indicating that the evaluation results are relatively robust. The MACRs provide information on the numerical changes in the evaluation values of green innovation capability, indicating the sensitivity of indicators associated with the size of the weights for different indicators. This result is consistent with that of a previous study [70].

Comparative Analysis
The coefficient of the variation-entropy weight method [71] and the grey correlation-TOPSIS method [72] were used to make decisions on the example, and the decision results obtained by the two methods are compared with the decision results of the method in this study. The results are presented in Table 11. The results of the comparison method are relatively consistent with the ranking results obtained using the cloud model method. Only the ranking of A obtained by the coefficient of the variation-entropy weight method is inconsistent. The main reason is that the coefficient of the variation-entropy weight method is more sensitive to the amount of indicator information. The corresponding weight of indicators with a large amount of information is greater, weighting results are contrary to practical experience, and there is a lack of expert judgment on the green innovation capability of enterprises, resulting in deviations in the evaluation results. The ranking results obtained by the grey correlation-TOPSIS method are the same as those obtained by the cloud model method, but the accurate numerical method fails to consider the fuzziness and randomness of the evaluation value. It cannot compare the entropy and hyper entropy evaluation values through the cloud map. Therefore, we believe that the proposed method is effective and stable.

Comparative Analysis
The coefficient of the variation-entropy weight method [71] and the grey correlation-TOPSIS method [72] were used to make decisions on the example, and the decision results obtained by the two methods are compared with the decision results of the method in this study. The results are presented in Table 11. The results of the comparison method are relatively consistent with the ranking results obtained using the cloud model method. Only the ranking of A obtained by the coefficient of the variation-entropy weight method is inconsistent. The main reason is that the coefficient of the variation-entropy weight method is more sensitive to the amount of indicator information. The corresponding weight of indicators with a large amount of information is greater, weighting results are contrary to practical experience, and there is a lack of expert judgment on the green innovation capability of enterprises, resulting in deviations in the evaluation results. The ranking results obtained by the grey correlation-TOPSIS method are the same as those obtained by the cloud model method, but the accurate numerical method fails to consider the fuzziness and randomness of the evaluation value.
It cannot compare the entropy and hyper entropy evaluation values through the cloud map. Therefore, we believe that the proposed method is effective and stable.

Conclusions and Prospect
Evaluating the green innovation capability of manufacturing enterprises is a complex activity that affects the market position and development strategy of enterprises. Based on niche theory, this study constructed an evaluation method for enterprise green innovation ability by using a cloud model tool. This method can comprehensively consider the impact of various subjective and objective factors in green innovation capability, which is conducive to making rapid innovation decisions according to market changes and needs.
The main contributions are as follows: (1) Based on niche situation theory, this study constructed an evaluation index system of the green innovation capability of enterprises based on three areas: R&D, production, and marketing. This study analyzed the enterprise's green innovation capability from the perspective of ecostate and ecorole, reflected the differential characteristics of green enterprise innovation, and widened the application scope of the niche situation theory.
(2) Using the combination weighting method of relative entropy and comprehensively considering AHP, entropy, and CV, the weight was obtained, which avoided the one-sidedness of the single weighting method. Simultaneously, it could reflect essential characteristics such as nonlinearity and the emergence of complex systems to obtain the results objectively.
(3) The evaluation model of green innovation capability was established using the cloud model theory. The evaluation indicator value of green innovation capability was transformed to the comment value so that the evaluation framework considered the fuzziness of the commentary interval and its randomness.
(4) Empirical research showed that this method could effectively evaluate the green innovation capability of enterprises, and the sensitivity analysis results showed that the proposed method is stable. This method provides a scientific basis for the evaluation standard in green innovation and the optimization path of enterprise green innovation.
In addition, the results of the empirical analysis provided some enlightenment to Chinese manufacturing enterprises that would help them to improve their green innovation ability. First, enterprises need to integrate multiple resources and capabilities, combine market incentives (special support fund and green credit), promote industry university research cooperation, and increase R&D investment to stimulate green innovation. Second, enterprises need to promote green innovation, optimize raw material investment, improve production processes, and strengthen the implementation of cleaner production in accordance with environmental regulatory policies (production technology standards and pollutant emission standards). Third, they must strengthen the organization, coordination, and control of all links in product manufacturing, and make full use of modern energy-saving and emission-reduction technologies in order to improve the utilization of materials. Fourth, enterprises must build a perfect intellectual property system to improve the patent application rate and conversion rate by increasing R&D investment and introducing high-quality R&D talents. Finally, enterprises need to make full use of market incentive policies, carry out research on key projects, break through the bottleneck of green technology, improve innovation ability, and implement the transformation to green and intelligent manufacturing.
However, this study has some limitations and deficiencies. During the construction of the index system, some factors may have been ignored, which may have affected the evaluation results. It is impossible to conduct extensive and sufficient empirical tests owing to the lack of a large number of samples. Therefore, future studies will have to expand the sample range, test, and improve the evaluation index system and model.