Universal portfolios generated by rational functions

<jats:p>The <jats:italic>f</jats:italic> -divergence of Csiszar is defined for a non-negative convex function on the positive axis. A pseudo <jats:italic>f</jats:italic> -divergence can be defined for a convex function not satisfying the usual requirements. A rational function where both the numerator and the denominator are non-integer polynomials will be used to generate universal portfolios. Five stock-price data sets from the local stock exchange are selected for the empirical study. Empirical results are obtained by running the generated portfolios on these data sets. The empirical results demonstrate that it is possible for the investors to increase their wealth by using the portfolios in investment.</jats:p>