[source] # Brier Score Brier Score is a *strictly proper* scoring metric that is equivalent to applying mean squared error to the probabilities of a probabilistic estimator. !!! note In order to maintain the convention of *maximizing* validation scores, this metric outputs the negative of the original score. **Estimator Compatibility:** Probabilistic Classifier **Score Range:** -2 to 0 ## Parameters This metric does not have any parameters. ## Example ```php use Rubix\ML\CrossValidation\Metrics\BrierScore; $metric = new BrierScore(); ``` ## References [^1]: G. W. Brier. (1950). Verification of Forecasts Expresses in Terms of Probability.