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AI 根据所提供的论文材料归类:摘要研究医疗预测与患者相似度,二元响应本身不足以归入经济学离散选择。

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关注这篇论文的作者
Minzee Kim
Joel A. Dubin

一种通过监督学习训练的患者相似度计算方法

研究问题
面向二元结局的个性化医疗预测,如何识别更合适的相似患者训练子集,并权衡预测区分度与校准表现?
方法与思路
作者提出预测变量加权的余弦相似度,利用 relaxed adaptive group lasso 监督估计权重,再据此选择个体化训练样本。
材料陈述的贡献
摘要称,模拟与重症监护数据分析显示校准略有下降、区分度明显提高,二者综合后的 Brier Score 表现改善。
阅读关注点
应核对权重学习与预测评估的数据划分、相似患者数量选择、校准和区分度指标,以及 Brier Score 比较的具体设置。
阅读边界
所给材料为 arXiv 预印本,不能确认同行评审或期刊接收。摘要未报告样本规模、改善数值及外部验证结果。

原文摘要

Personalized predictive modelling has been growing rapidly with the increasing availability of Electronic Health Records. This approach aims to improve a model's predictive performance by fitting a unique model to each individual. We train the model on a subset of the training data consisting of individuals similar to the individual being predicted, identified through some similarity metric. Earlier studies show that using a personalized model trained on a customized subset of the data leads to better prediction than using a global model trained on the full dataset. In this work, we develop a new patient similarity metric to improve the prediction of a personalized model for binary response data. Specifically, we introduce a weighted cosine similarity metric that extends the standard cosine similarity metric by assigning predictor-specific weights when computing similarity between participants. These weights are estimated using a supervised approach with the relaxed adaptive group lasso. Results from simulation studies and an analysis of intensive care unit data show that although our proposed similarity metric leads to a slight deterioration in calibration, it produces substantial gains in discrimination. Overall predictive performance measured by the Brier Score improves because the increase in discrimination outweighs the loss in calibration; therefore, our proposed similarity metric more effectively identifies similar participants, resulting in improved predictive accuracy.

笔记与分组
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