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arXiv 2401.04263stat.ME
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非负两部分结局的两步目标最小损失估计

Two-Step Targeted Minimum-Loss Based Estimation for Non-Negative Two-Part Outcomes

Nicholas T. Williams, Richard Liu, Katherine L. Hoffman, Sarah Forrest, Kara E. Rudolph, Iván Díaz

AI总结:

本文针对非负两部分结局提出了一种非参数两步目标最小损失估计器(hTMLE),通过修正治疗策略适应多种暴露类型,利用结局强度分量的目标估计提升二元分量的有限样本效率,模拟和真实数据证明了其效率提升。

摘要:

非负两部分结局被定义为具有零点质量但其他情况下为正的密度函数的结局。例如,医疗保健支出和住院时间在医疗保健利用研究中很常见。尽管非负两部分结局具有实际相关性,但很少有方法能够利用其半连续性知识来提高估计因果效应的性能。在本文中,我们为非负两部分结局开发了一种非参数两步目标最小损失估计器(记为hTMLE)。我们提出了一类被称为修正治疗策略的通用干预方法,该方法可以适应连续、分类和二元暴露。两步TMLE使用结局强度分量的目标估计来生成结局二元分量的目标估计,这可能提高有限样本效率。我们通过模拟示例证明了两步TMLE实现的效率提升,然后将其应用于Medicaid受益人群,以估计慢性疼痛和身体残疾对阿片类药物供应天数的影响。

英文摘要:

Non-negative two-part outcomes are defined as outcomes with a density function that have a zero point mass but are otherwise positive. Examples, such as healthcare expenditure and hospital length of stay, are common in healthcare utilization research. Despite the practical relevance of non-negative two-part outcomes, very few methods exist to leverage knowledge of their semicontinuity to achieve improved performance in estimating causal effects. In this paper, we develop a nonparametric two-step targeted minimum-loss based estimator (denoted as hTMLE) for non-negative two-part outcomes. We present methods for a general class of interventions referred to as modified treatment policies, which can accommodate continuous, categorical, and binary exposures. The two-step TMLE uses a targeted estimate of the intensity component of the outcome to produce a targeted estimate of the binary component of the outcome that may improve finite sample efficiency. We demonstrate the efficiency gains achieved by the two-step TMLE with simulated examples and then apply it to a cohort of Medicaid beneficiaries to estimate the effect of chronic pain and physical disability on days' supply of opioids.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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