Affiliations: [a] School of Economy and Trade, Hebei GEO University, Shijiazhuang, Hebei, China | [b] Business School, Trinity College Dublin, The University of Dublin, Dublin, Ireland
Correspondence:
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Corresponding author: Kun Zhao, Business School, Trinity College Dublin, The University of Dublin, College Green, Dublin, Ireland. E-mail: kunzzk@yeah.net.
Abstract: The optimization of investment portfolio is the key to financial risk investment. In this study, the investment portfolio was optimized by removing the noise of covariance matrix in the mean-variance model. Firstly, the mean-variance model and noise in covariance matrix were briefly introduced. Then, the correlation matrix was denoised by KR method (Sharifi S, Grane M, Shamaie A) from random matrix theory (RMT). Then, an example was given to analyze the application of the method in financial stock investment portfolio. It was found that the stability of the matrix was improved and the minimum risk was reduced after denoising. The study of minimum risk under different M values and stock number suggested that calculating the optimal value of M and stock number based on RMT could achieve optimal financial risk investment portfolio result. It shows that RMT has a good effect on portfolio optimization and is worth promoting widely.
Keywords: Investment portfolio, mean-variance, noise, random matrix theory
