Measure Drift with PSI and KS
Quantify distribution shift on each feature.
From Hunch to Number
Saying a feature feels different is not enough. You need a number that says how much its distribution moved. Two trusted tools are PSI and the KS test. 📏
What PSI Measures
The Population Stability Index compares a feature now against training, bin by bin. The bigger the gap in each bin, the higher the score.
All lessons in this course
- Data Drift vs Concept Drift
- Measure Drift with PSI and KS
- Generate Drift Reports with Evidently
- Set Drift Thresholds and Triggers