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Data Analysis · Business / AGENT SKILL
risk-metrics-calculation
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Calculate portfolio risk metrics, including VaR, CVaR, Sharpe, Sortino, and drawdowns.
Calculate portfolio risk metrics including VaR, CVaR, Sharpe, Sortino, and drawdown analysis. Use when measuring portfolio risk, implementing risk limits, or building risk monitoring systems.
Understand the trade-offs.
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Original instructions from the publisher’s SKILL.md
# Risk Metrics Calculation Comprehensive risk measurement toolkit for portfolio management, including Value at Risk, Expected Shortfall, and drawdown analysis. ## When to Use This Skill - Measuring portfolio risk - Implementing risk limits - Building risk dashboards - Calculating risk-adjusted returns - Setting position sizes - Regulatory reporting ## Core Concepts ### 1. Risk Metric Categories | Category | Metrics | Use Case | | ----------------- | --------------- | -------------------- | | **Volatility** | Std Dev, Beta | General risk | | **Tail Risk** | VaR, CVaR | Extreme losses | | **Drawdown** | Max DD, Calmar | Capital preservation | | **Risk-Adjusted** | Sharpe, Sortino | Performance | ### 2. Time Horizons ``` Intraday: Minute/hourly VaR for day traders Daily: Standard risk reporting Weekly: Rebalancing decisions Monthly: Performance attribution Annual: Strategic allocation ``` ## Detailed patterns and worked examples Detailed pattern documentation lives in `references/details.md`. Read that file when the navigation tier above is insufficient. ## Best Practices ### Do's - **Use multiple metrics** - No single metric captures all risk - **Consider tail risk** - VaR isn't enough, use CVaR - **Rolling analysis** - Risk changes over time - **Stress test** - Historical and hypothetical - **Document assumptions** - Distribution, lookback, etc. ### Don'ts - **Don't rely on VaR alone** - Underestimates tail risk - **Don't assume normality** - Returns are fat-tailed - **Don't ignore correlation** - Increases in stress - **Don't use short lookbacks** - Miss regime changes - **Don't forget transaction costs** - Affects realized risk