Statistical Analysis Of Top Social Security Funds' Shareholding Preference

The increasing status of Chinese stock market in national economy also makes more and more people participate in the investment of stock market.Stock investors are mainly divided into individual investment and institutional investment.Compared with individual investment,institutional investment has the following two obvious advantages.First,institutional investors have received professional training in stock investment,have a relatively good management team,have information advantages,strong stock selection ability,and avoid a lot of irrational investment behavior;Second,investment institutions have a large scale of capital,unlimited investment areas,and low trial and error costs.Social security Fund is not only managed by the state as a whole,with a huge fund scale,but also managed on behalf of top investment institutions in the country.These fund managers have very strong investment professional skills,which makes social Security fund has been recognized by the society as a whole in avoiding risks and improving returns.Therefore,it is necessary to study the investment preference of social security fund.Among the numerous social security funds in the country,are there any social security funds with the highest investment efficiency? What are their stock-picking preferences? This is the focus of this paper.In order to study the above issues,this paper selects the data of A-share listed companies in the last two years for research.The data covers 15 quarters from the first quarter of 2019 to the second quarter of2022,plus the fourth quarter of 2018 as the reference object.Based on the above,the main work of this paper is summarized as follows.1.Firstly,collect and sort the data of 15 quarters to be studied,check and troubleshoot the data,use MATLAB programming to find out the number of shares held by each social security fund in each quarter,and calculate the income of social security fund holdings in two parts according to the changes of stock prices,and finally get the rate of return of social security fund holdings;2.Based on the above yield results of social security fund holdings,K-means cluster analysis method and hierarchical cluster analysis method are used for comparison to select the top social security funds in China;3.Independent variables were selected from growth ability,per share index,profitability,solvency and enterprise comprehensive index,and the shareholding ratio of top social security funds was selected as the dependent variable to establish multiple stepwise regression analysis;4.Analyze the results and draw conclusions.From the perspective of enterprise growth indicators,top social security funds have a certain degree of attention to it,mainly prefer to net profit;From the perspective of enterprise per share index,basic earnings per share and net asset per share are quite significant.There is no obvious significance in the listing time of enterprises;With the same nature of enterprises in the same industry,enterprises with larger scale and higher concentration of tradable shares are more likely to be favored by top social security funds.