# Precision [Recall](Recall.md) Curve - [Precision](Precision.md) + [Recall](Recall.md) - appropriate when dataset imbalanced - no-skill line changes based on the distribution of the positive to negative classes - horizontal line with the value of the ratio of positive cases in the dataset - balanced this is 0.5 - skilful model is represented by a curve that bows towards (1,1) above the flat line of no skill