Optimization,cointegration and diversification gains from international portfolios: an out-of-sample analysis

This study investigates comparative performance of iShares and their underlying market indices in a portfolio context from the perspective of U.S. investors. Two aspects are important. First, portfolios based on standard optimization procedures and a portfolio based on cointegration procedures are created and out-of-sample performance is compared. The portfolio utilizing cointegration inputs shows superior out-of-sample performance. Second, portfolio performance measurement is extended to different holding periods. The findings do not differ.