1<span style="float:right;"><a href="https://github.com/RubixML/ML/blob/master/src/CrossValidation/Metrics/Informedness.php">[source]</a></span> 2 3# Informedness 4Informedness a multiclass generalization of Youden's J Statistic and can be interpreted as the probability that an estimator will make an informed prediction. Its value ranges from -1 through 1 and has a value of 0 when the test yields no useful information. 5 6$$ 7{\displaystyle Informedness = {\frac {\text{TP}}{{\text{TP}}+{\text{FN}}}}+{\frac {\text{TP}}{{\text{TN}}+{\text{FP}}}}-1} 8$$ 9 10**Estimator Compatibility:** Classifier, Anomaly Detector 11 12**Output Range:** -1 to 1 13 14## Parameters 15This metric does not have any parameters. 16 17## Example 18```php 19use Rubix\ML\CrossValidation\Metrics\Informedness; 20 21$metric = new Informedness(); 22``` 23 24## References 25[^1]: W. J. Youden. (1950). Index for Rating Diagnostic Tests.