# Risk Models

- [ANNUALIZERISK](/functions/risk-models/annualizerisk.md): Annualize discrete estimates of standard deviation to account for the compounding effects on assets.
- [EWMA](/functions/risk-models/ewma.md): Estimate expected risk, correlation matrix, or covariance matrix for assets using the exponential-weighted moving average risk model (EWMA).
- [HISTORICALRISK](/functions/risk-models/historicalrisk.md): Estimate expected risk, correlation matrix, or covariance matrix for assets using historical data.
- [MLERISK](/functions/risk-models/mlerisk.md): Estimate expected risk, correlation matrix, or covariance matrix for assets with incomplete historical data (unequal lengths) with a maximum likelihood estimator.
- [PORTFOLIORISK](/functions/risk-models/portfoliorisk.md): Calculate portfolio risk from a vector of weights, risk, and correlation matrix.
- [TURBULENTRISK](/functions/risk-models/turbulentrisk.md): A robust statistical risk model using the Mahalanobis distance.
- [QUIETRISK](/functions/risk-models/quietrisk.md): A robust statistical risk model using the Mahalanobis distance.