统计与数据科学学院知识库

创新是我国实施创新驱动发展战略、迈向科技强国以及寻求经济新增长点的关键。党的二十大报告指出“坚持创新在我国现代化建设全局中的核心地位。加快实施创新驱动发展战略，强化企业科技创新主体地位”。作为区域创新的重要空间载体，城市已经成为创新要素、创新活动和创新产出的重要集聚地。提高城市创新水平是实施国家创新驱动发展战略的基础，数字经济的蓬勃发展赋予城市创新更丰富的内涵和要求，也为提升城市创新水平提供新机遇和新路径。同时数字经济的蓬勃发展为城市创新活动中的要素流动、产业升级等提供技术保障，为传统产业转型与升级提供创新性思路，同时数字技术还为推动城市和企业创新提供新的契机。因此，厘清数字经济赋能城市创新水平的具体机制和实现路径，对“十四五”时期我国城市高质量发展、促进区域协调发展以及扎实实施创新驱动战略都有重要意义。

本文将数字经济和城市创新水平纳入同一个理论框架，定性分析数字经济对城市创新水平影响的内在机理、作用机制以及空间效应并提出相应研究假设。基于数字经济的内涵，选取构建多维度城市层面数字经济综合评价体系并进行统计测度，同时对数字经济发展水平和城市创新水平进行区域差异、时空演变分析。研究发现：我国数字经济发展水平和城市创新水平整体呈上升趋势，有轻微的多极化现象出现，并且各城市之间的发展差距在逐渐扩大。我国城市数字经济发展水平的总体区域差异呈现波动中缓慢上升趋势，区域间差异是数字经济发展水平 主要差异来源；而我国城市创新水平的区域差异整体上呈逐年下降趋势，并且呈现收敛性特征。

同时，基于2011-2021年我国287个地级市（除港澳台、西藏等数据缺失严重的城市）的面板数据，运用双向固定效应模型、中介效应模型、面板分位数模型和空间杜宾模型等计量模型在理论基础上实证分析数字经济对城市创新水平的影响效应。研究发现：数字经济能显著提升城市创新水平，且对城市创新水平的各个维度均有显著的促进作用，并且数字经济可以通过提高人力资本水平和缓解融资约束对城市创新水平产生积极的促进作用；同时数字经济对城市创新水平的促进作用存在显著的区域异质性、城市等级异质性和时间异质性；另外数字经济的发展对城市创新水平存在显著的空间溢出效应，数字经济通过涓滴效应，各城市的创新活动不仅受本地区数字经济发展的影响，也会受到周边城市数字经济活动的影响。

Innovation is the key to my country's implementation of innovation -driven development strategies, moving towards the power of technology, and seeking new economic growth points. The 20th National Congress of the Communist Party of China pointed out that "adhere to the core position of innovation in the overall situation of my country's modern construction. Accelerate the implementation of innovation -driven development strategies and strengthen the status of corporate scientific and technological innovation." As an important space carrier for regional innovation, cities have become an important gathering place for innovation elements, innovation activities and innovative output Improving urban innovation capabilities is the basis for implementing the national innovation-driven development strategy. The vigorous development of the digital economy has given the city's innovation more rich connotation and requirements, and also provides new opportunities and new paths for improving urban innovation capabilities. The booming development of the digital economy provides technical guarantees for the flow of elements, multi-subject coordinated innovation, and industrial upgrading in urban innovation activities, providing innovative ideas for the transformation and upgrading of traditional industries. At the same time Opportunity. Therefore, clarifying the specific mechanism and implementation path of digital economy empowering urban innovation capabilities, it is of great significance for the high-quality development of my country's cities, and solid implementation of innovation -driven strategies during the "Fourteenth Five -Year Plan" period.

This article brings the digital economy and urban innovation level into the same theoretical framework, qualitatively analyzes the internal mechanism, action mechanism and spatial effect of the digital economy's impact on urban innovation level, and proposes corresponding research hypotheses. Based on the connotation of digital economy, we choose to construct a multi-dimensional city-level digital economy comprehensive evaluation system and conduct statistical measurements. At the same time, we analyze regional differences and spatio-temporal evolution of the development level of the digital economy and the level of urban innovation. The study found that my country's digital economy development level and urban innovation level are on an overall upward trend, with a slight multi-polarization phenomenon emerging, and the development gap between cities is gradually widening. The overall regional differences in the development level of my country's urban digital economy show a slowly rising trend with fluctuations, and inter-regional differences are the main source of differences in the development level of the digital economy; while the overall regional differences in the level of innovation in my country's cities show a downward trend year by year, and show convergence characteristics.

At the same time, based on 2011-2021, panel data of 287 prefecture-level cities in my country (except Hong Kong, Macao, Taiwan, Tibet, etc.), use two-way fixed effect models, intermediary effect models, panel division models, and space Dubin models. Emphasized the influence of the digital economy on the level of urban innovation based on the theoretical basis. Studies have found that the digital economy can significantly improve the level of urban innovation, and the digital economy has a significant promotion effect on all dimensions of urban innovation, and the digital economy can actively promote the level of urban innovation by improving the level of human capital and alleviating financing constraints to the level of urban innovation. Practice; at the same time, the digital economy's promotion of urban innovation level has significant regional heterogeneity, urban heterogeneous heterogeneity and time heterogeneity. In addition, the development of the digital economy has a significant space overflow effect on the level of urban innovation. The trickle effect, the innovative activities of various cities are not only influenced by the development of the digital economy in the region, but also affected by the digital economic activities of surrounding cities.