Why Accuracy Can Lie
The trouble with a single number.
Accuracy, Defined
Accuracy is just the share of predictions your model got right out of all predictions. Simple, but it can quietly mislead you. 🎯
The Single-Number Trap
One number feels reassuring, but accuracy hides which kinds of mistakes you make. A high score can mask a model that fails where it matters most.
All lessons in this course
- Why Accuracy Can Lie
- Precision, Recall, and F1
- Reading the Confusion Matrix
- Cross-Validation Done Right