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---
title: "Population Stability Index (PSI)"
type: concept
tags: [ml-ops, model-monitoring, drift]
sources: [specialized-model-qa]
last_updated: 2026-04-20
---
## Definition
Population Stability IndexPSI用于衡量两个样本分布之间的变化程度常见于模型监控与特征稳定性分析。
## Interpretation
- < 0.10:无显著偏移
- 0.100.25:中等偏移,需要调查
- ≥ 0.25:显著偏移,需要处理
## Use in Model QA
- 检测特征漂移
- 识别训练集与生产集分布差异
- 为复审与再训练提供量化证据
## Related Concepts
- [[Model Audit]]
- [[Calibration Testing]]
- [[Discrimination Metrics]]