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The Madison Avenue Field GuideA field guide to marketing & advertising, by Brandon Mina

GlossaryMeasurement & AttributionAnomaly Detection

Measurement & Attribution

Anomaly Detection

Automatically flagging data points that deviate sharply from expected patterns, such as sudden traffic drops or tracking breaks.

By Brandon MinaCEO, BrandPilot AIUpdated November 2026

Short answer

Anomaly detection is the automatic flagging of data points that deviate sharply from expected patterns, such as sudden traffic drops, conversion spikes, or tracking breaks. Analytics tools use statistical models of normal behavior to alert teams quickly, helping them spot technical problems, fraud, or genuine performance shifts before decisions rely on faulty data.