Beginner
What It Means
Raw returns don’t tell the whole story. Risk-adjusted returns answer the question: “How much return did I get for each unit of risk I took?” Higher risk-adjusted returns mean more efficient use of risk.Portfolio Example
Portfolio B is actually better - it generated nearly as much return with far less risk. You could leverage Portfolio B to match Portfolio A’s risk and get higher returns.
Why It Matters
Comparing raw returns is misleading. A hedge fund returning 20% with 40% volatility isn’t necessarily better than an index fund returning 10% with 15% volatility. Risk-adjusted metrics reveal true performance quality.Advanced
Key Risk-Adjusted Metrics
Sharpe Ratio
The most common risk-adjusted measure:Sortino Ratio
Focuses only on downside risk:Sortino is often preferred because investors don’t mind upside volatility - only downside hurts. A stock that jumps 10% isn’t “risky” in any meaningful sense.
Calmar Ratio
Uses maximum drawdown as the risk measure:Comparing Metrics
Practical Application
When to use each metric:- Sharpe: Comparing any strategies against each other
- Sortino: When you care specifically about losses
- Calmar: When drawdowns are your primary concern
- Information Ratio: Evaluating active managers vs. benchmark
- Treynor: Comparing well-diversified portfolios
Limitations
- Backward-Looking: Past risk-adjusted returns don’t guarantee future performance
- Distribution Assumptions: Most assume normal returns (reality has fat tails)
- Time Period Sensitive: Results vary significantly by measurement period
- Gaming: Some strategies artificially inflate ratios (selling options, smoothing)
Related Terms
Sharpe Ratio
Most common measure
Volatility
The denominator in most metrics
Drawdown
Used in Calmar Ratio