Definition How often a model's predictions are correct, shown as a percentage of all predictions.
Example A model that gets 90 of 100 predictions right has 90% accuracy.
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Why it matters It gives a quick sense of model quality, but can mislead on imbalanced data.
Where it is used AI model reports, fraud detection tools and data science reviews.
How to calculate it Correct predictions ÷ total predictions × 100
Worked example A model that gets 90 of 100 predictions right has 90% accuracy.
