Population Stability Index (PSI): Quantifying Data Drift
The Population Stability Index (PSI) gives you a single number to quantify data drift between training and live data. It's used in MLOps to monitor model health, especially in finance. The footgun is ignoring a high PSI, which signals silent prediction decay.
The Population Stability Index (PSI) boils down the difference between two data distributions (e.g., training vs. production) into one number, answering 'how much has my data's shape changed?'. It's a core MLOps tool for detecting data drift. For instance, a credit scoring model will become unreliable if new applicants' incomes shift; PSI flags this. The footgun is that binning choices can hide or exaggerate drift, and a high PSI only tells you *that* data has changed, not *why*.
Read the original → geeksforgeeks.org
- #mlops
- #data drift
- #statistics
- #model monitoring
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