arXiv Computation and Language By Zengqing Wu, Chuan Xiao

Language Models Give Group-Linked Fields the Wrong Weight

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The paper introduces an evidence‑referenced audit for large language models that assesses how much predictive information proxy fields contribute, comparing model reliance to a known outcome rule and a Bayesian linear regression. Applied to a simulated patient‑ranking task, the study finds that models rely on non‑informative fields, grow less reliance as proxies become predictive, are sensitive to display format, and that ranking accuracy does not reliably indicate proxy reliance. The authors argue that audits should report reliance against explicit predictive references alongside accuracy to properly evaluate model behavior.

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