US Patent 7672890 Signal testing methodology for long-only portfolios

Described are methods and apparatus, including computerized methods and computer program products, for signal testing for a long-only portfolio. The methodology can be used for assessing the efficacy of a strategy for selecting securities in a long-only portfolio, and the strategy can be implemented to construct a revised long-only portfolio. The signal testing methodology can take into account the position and/or return of securities that do not have either a positive or negative attribute as well.