Omega Ratio
Updated 2026-08-13
INTRODUCTION
English translation pending.
CORE DEFINITION
The Omega ratio is a risk-adjusted performance measure defined as the ratio of the probability-weighted gains above a chosen threshold to the probability-weighted losses below it. The core proposition is that mean and variance summarize a distribution only when returns are symmetric, so a measure that integrates the entire distribution captures skewness and tail risk that the Sharpe ratio misses. The key qualification is that the result depends on the threshold chosen, so comparisons are only meaningful when the same threshold is applied.
SCAFFOLDING EFFECT
Reduce cognitive load
- Threshold setting: choose the return level that counts as success before computing anything at all. - Distribution read: inspect the shape of gains and losses rather than simply assuming symmetry. - Cross comparison: compare ratios only across assets that were evaluated at the same threshold.
Anchor fast decisions
Integrating the gains above the threshold and the losses below it uses every observation rather than only the first two moments. A strategy with rare large losses shows up immediately, because those losses enter the denominator with their full magnitude. The measure therefore rewards distributions whose upside is thick and whose downside is thin, which is precisely what a mean-variance ratio cannot express.
MINIMUM ACTION
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Omega_ratioverified
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