Abstract
We discuss - in what is intended to be a pedagogical fashion - generalized mean-to-risk ratios for portfolio optimization. The Sharpe ratio is only one example of such generalized mean-to-risk ratios. Another example is what we term the Fano ratio (which, unlike the Sharpe ratio, is independent of the time horizon). Thus, for long-only portfolios optimizing the Fano ratio generally results in a more diversified and less skewed portfolio (compared with optimizing the Sharpe ratio). We give an explicit algorithm for such optimization. We also discuss (Fano-ratio-inspired) long-short strategies that outperform those based on optimizing the Sharpe ratio in our backtests.
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