Glossary

4. Train/test gap

Compare random split performance to temporal split performance - A large gap (> 0.05 AUC) suggests either temporal leakage or concept drift

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Intermediate Data Science — Case Study 2: The Data Leakage Detective

Related Terms

"Did the retention offer work?" $537,600/month in retained revenue 1. Preprocessing 1. Suspiciously high performance 14.2% 2,735 False Alarms and That Is Fine 2. Characterize your data. 2. Feature importance dominance

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