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Quantitative Finance · Glosario

¿Qué es Breadth, fundamental law of active management?

También llamado: breadth · fundamental law of active management

Definition 15.4 Research Craft: Predictors, Backtests, Measurement, Portfolios · Capítulo 15 — From Signal to Forecast

The breadth of a strategy is the number of independent forecasts it acts on per year. The fundamental law of active management (Grinold, 1989) states that the information ratio of the optimal portfolio built on forecasts with information coefficient IC\mathrm{IC} and breadth BR\mathrm{BR} is IR≈ICBR\mathrm{IR} \approx \mathrm{IC}\sqrt{\mathrm{BR}}.

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