[source] # R Squared The *coefficient of determination* or R Squared (R²) is the proportion of the variance in the target labels that is explainable from the predictions. It gives an indication as to how well the predictions approximate the labels. $$ {\displaystyle R^{2} = 1-{SS_{\rm {res}} \over SS_{\rm {tot}}}} $$ **Estimator Compatibility:** Regressor **Score Range:** -∞ to 1 ## Parameters This metric does not have any parameters. ## Example ```php use Rubix\ML\CrossValidation\Metrics\RSquared; $metric = new RSquared(); ```