综上所述,中部六省区域在2007-2014年期间的创新效率有所提高,并且在两个阶段的提升速度存在差异。技术进步是创新效率的主要推动力,政府支持和企业投入也起到了积极的作用。然而,仍然需要进一步研究不同省区域的特点和环境差异对创新效率的影响。 参考文献: [1] Liang H., Zhang X., & Yang Y. (2017). The analysis on the innovation efficiency and influencing factors of China's mechanical industry based on the DEA. IOP conference series: materials science and engineering. 273(1): 012101. [2] Song T. & Ma W. (2015). The measurement of energy technology innovation efficiency based on DEA and panel data analysis. Energy Procedia. 75: 2193-2198. [3] Chen K., Guo R., & Si J. (2014). Efficiency evaluation of China's energy conservation based on DEA model. Renewable and Sustainable Energy Reviews. 29: 49-54.