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B. van Calster

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#artificial intelligence Preprint Aug 2026

Collapsibility of Performance Metrics in Clinical Predictive AI

The AUC is shown to be non-collapsible because it decomposes into within- and cross-group AUC terms when subpopulations coexist, such that its overall value may fall outside the range of subgroup specific AUCs.

João Matos, B. van Calster, Richard D. Riley et al. · 0 citations