Research On Investment Portfolio Strategy Based On The Construction Of The Sci-tech Innovation Board Stock Network

STAR Market was listed in 2019 in China.As the latest stock market in China,STAR Market has been widely concerned with its pioneering system and special strategic significance for high-tech companies.However,the academic research on STAR Market is still in a blank stage.There is less research on the network structure of STAR Market.In this paper,under the important background of the successful opening of STAR Market,using the theory technology of complex network and minimum spanning tree,combining with Matlab,gephi and other software to program,calculate and draw,taking the closing price of all the existing stocks of STAR Market and the concept stocks of STAR Market in the main board as the data,the STAR Market network and the combination network of STAR Market and concept stocks of STAR Market are constructed Collaterals.Through the parameter analysis of the two networks,including degree,degree distribution,clustering coefficient,modular Q value,this paper successfully found some important stock nodes that affect the trend of STAR Market,and found the characteristics of high correlation between STAR Market stocks and large phenomenon of stock community clustering,and obtained the conclusion that the development stage of STAR Market is in a relatively immature stage in terms of its classification components.According to the results of the research on the network of STAR Market,this paper designs a strategy to build a portfolio by using the comprehensive evaluation value constructed by the degree value of science and technology innovation board,community structure and risk aversion factor at the same time.Using this strategy to construct the portfolio of science and technology innovation board successfully achieved higher average return and lower average risk level.The risk return ratio is far higher than the value of traditional industry classification,which is effective.