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arXiv 2511.04496stat.ME
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随机缺失下校准加权的一种通用方法

A General Approach for Calibration Weighting under Missing at Random

Yonghyun Kwon, Jae Kwang Kim, Yumou Qiu

AI总结:

本文提出基于加权广义熵的统一校准加权方法GEC,通过凸优化统一熵方法与广义回归加权,并结合去偏约束与Neyman正交约束实现双重稳健性,同时给出几何解释和高维扩展。

摘要:

我们提出了一类基于加权广义熵的统一校准加权方法,用于处理随机缺失(MAR)数据,并具有改进的稳定性和效率。所提出的广义熵校准(GEC)将权重构造表述为一个凸优化程序,统一了基于熵的方法和广义回归加权。通过在标准协变量平衡基础上增加一个与倾向得分模型相关的去偏约束,以及一个消除对冗余估计一阶敏感性的Neyman正交约束,实现了双重稳健性。在正确指定的结果回归模型下,对熵函数上权重的选择可以得到最优校准估计量。所提出的GEC加权具有一个良好的几何特征:GEC解是初始权重在约束集上的Bregman投影,由此产生一个广义勾股恒等式和一个嵌套分解,用于量化因额外约束而产生的增量距离。我们还开发了一个具有软校准和投影校准约束的高维扩展,以保持双重稳健推断。文中给出了两个模拟研究,用于比较所提方法与现有方法的性能。

英文摘要:

We propose a unified class of calibration weighting methods based on weighted generalized entropy to handle missing at random (MAR) data with improved stability and efficiency. The proposed generalized entropy calibration (GEC) formulates weight construction as a convex optimization program that unifies entropy-based approaches and generalized regression weighting. Double robustness is achieved by augmenting standard covariate balancing with a debiasing constraint tied to the propensity score model and a Neyman-orthogonal constraint that removes first-order sensitivity to nuisance estimation. Selection of the weights on the entropy function can lead to the optimal calibration estimator under a correctly specified outcome regression model. The proposed GEC weighting ha a nice geometric characterization: the GEC solution is the Bregman projection of the initial weights onto a constraint set, which yields a generalized Pythagorean identity and a nested decomposition that quantifies the incremental distance paid for additional constraints. We also develop a high-dimensional extension with soft calibration and a projection calibration constraint that preserves doubly robust inference. Two simulation studies are presented to compare the performance of the proposed method with the existing methods.

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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