Time-varying mean-variance portfolio selection problem solving via LVI-PDNN

It is widely acclaimed that the Markowitz mean-variance portfolio selection is a very important investment strategy. One approach to solving the static mean-variance portfolio selection (MVPS) problem is based on the usage of quadratic programming (QP) methods. In this article, we define and study the time-varying mean-variance portfolio selection (TV-MVPS) problem both in the cases of a fixed target portfolio's expected return and for all possible portfolio's expected returns as a time-varying quadratic programming (TVQP) problem. The TV-MVPS also comprises the properties of a moving average. These properties make the TVMVPS an even greater analysis tool suitable to evaluate investments and identify trading opportunities across a continuous-time period. Using an originally developed linear-variational-inequality primal-dual neural network (LVI-PDNN), we also provide an online solution to the static QP problem. To the best of our knowledge, this is an innovative approach that incorporates robust neural network techniques to provide an online, thus more realistic, solution to the TV-MVPS problem. In this way, we present an online solution to a time varying financial problem while eliminating static method limitations. It has been shown that when applied simultaneously to TVQP problems subject to equality, inequality and boundary constraints, the LVI-PDNN approaches the theoretical solution. Our approach is also verified by numerical experiments and computer simulations as an excellent alternative to conventional MATLAB methods.

Automated summary

The study focuses on the time-varying mean-variance portfolio selection (TV-MVPS) problem, using quadratic programming (QP) methods to address both static and time-varying scenarios. The TV-MVPS incorporates properties like moving averages and utilizes a linear-variational-inequality primal-dual neural network (LVI-PDNN) to offer an online solution. This innovative approach proves to be a robust alternative to conventional methods, providing real-time solutions to financial problems while overcoming static method limitations.