By modifying the denominator, both the Sharpe ratio and information ratio provide correct rankings during periods of negative excess returns.
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Israelsen, C. A refinement to the Sharpe ratio and information ratio. J Asset Manag 5, 423–427 (2005). https://doi.org/10.1057/palgrave.jam.2240158
- Sharpe ratio
- information ratio
- negative excess returns
- tracking error