基于创新绩效评价已有研究成果,构建科创板上市企业创新效率评价指标体系和模型,并以74家已上市企业作为研究对象,运用D E A方法合理评价科创板上市企业在上市前的创新绩效水平,分析企业在科技创新中存在的问题及原因,为科创板上市企业...基于创新绩效评价已有研究成果,构建科创板上市企业创新效率评价指标体系和模型,并以74家已上市企业作为研究对象,运用D E A方法合理评价科创板上市企业在上市前的创新绩效水平,分析企业在科技创新中存在的问题及原因,为科创板上市企业优化资源配置提供一定指导建议。展开更多
Stock indices were created to accurately reflect changes in the prices of stock exchange securities included in them.Indices are divided into price-weighted and value-weighted indices.In price-weighted indices,each se...Stock indices were created to accurately reflect changes in the prices of stock exchange securities included in them.Indices are divided into price-weighted and value-weighted indices.In price-weighted indices,each security has the same impact on the index,which is the arithmetic mean of the stock values of the companies it comprises.A value-weighted index accounts for changes in the value of shareholdings.By choosing the right composition of share packages,one can change the impact of a given security on the index.Market dynamics also change the composition of the index by removing securities and replacing them with others.The impact on the index grows as the price of a given security increases.Recently,index values have been strongly influenced by new technology companies,which have greatly appreciated during the SARS-CoV-2 pandemic.The aim of this work is to show the changes in two indices in particular:US NASDAQ Composite,and the new competitive SSE STAR index,an index from the Shanghai Stock Exchange.展开更多
文摘Stock indices were created to accurately reflect changes in the prices of stock exchange securities included in them.Indices are divided into price-weighted and value-weighted indices.In price-weighted indices,each security has the same impact on the index,which is the arithmetic mean of the stock values of the companies it comprises.A value-weighted index accounts for changes in the value of shareholdings.By choosing the right composition of share packages,one can change the impact of a given security on the index.Market dynamics also change the composition of the index by removing securities and replacing them with others.The impact on the index grows as the price of a given security increases.Recently,index values have been strongly influenced by new technology companies,which have greatly appreciated during the SARS-CoV-2 pandemic.The aim of this work is to show the changes in two indices in particular:US NASDAQ Composite,and the new competitive SSE STAR index,an index from the Shanghai Stock Exchange.