25 lines
663 B
Markdown
25 lines
663 B
Markdown
---
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title: "Population Stability Index (PSI)"
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type: concept
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tags: [ml-ops, model-monitoring, drift]
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sources: [specialized-model-qa]
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last_updated: 2026-04-20
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---
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## Definition
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Population Stability Index（PSI）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。
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## Interpretation
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- < 0.10：无显著偏移
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- 0.10–0.25：中等偏移，需要调查
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- ≥ 0.25：显著偏移，需要处理
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## Use in Model QA
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- 检测特征漂移
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- 识别训练集与生产集分布差异
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- 为复审与再训练提供量化证据
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## Related Concepts
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- [[Model Audit]]
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- [[Calibration Testing]]
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- [[Discrimination Metrics]] |