juniorModel Evaluation
What is ROC-AUC?
Updated May 17, 2026
Short answer
ROC-AUC measures model ability to distinguish classes across thresholds.
Deep explanation
ROC plots true positive rate vs false positive rate; AUC summarizes overall performance.
Real-world example
Used in credit scoring systems to rank risk levels.
Common mistakes
- Confusing AUC with accuracy.
Follow-up questions
- What does AUC = 0.5 mean?
- Why threshold-independent?