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AI 根据所提供的论文材料归类:摘要讨论通用多研究、多模态因子模型,未提供宏观因子或金融因子应用的依据。

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关注这篇论文的作者
Wei Liu
Qingzhi Zhong

高维多研究、多模态协变量增强广义因子模型

研究问题
当多个研究分别测量多种数据模态且含额外协变量时,如何统一建模共享和研究特异的潜在因子,并实现可识别、可计算的估计?
方法与思路
作者提出协变量增强的广义因子模型,通过变分下界近似似然、剖面化变分参数和变分 EM 估计,并设计共享与特异因子数准则。
材料陈述的贡献
摘要称,论文研究可识别性及参数估计的渐近性质,模拟和真实应用显示准确性与计算效率改善,并提供公开的 R 软件包。
阅读关注点
应核对因子的旋转与共享结构识别条件、变分近似对目标参数的影响,以及高维渐近设定、因子数选择和比较基准。
阅读边界
这是 arXiv 预印本,同行评审或期刊接收未核实。摘要未说明具体模态、渐近条件和比较数值,不能确认对所有数据整合任务均有优势。

原文摘要

Latent factor models that integrate data from multiple sources/studies or modalities have garnered considerable attention across various disciplines. However, existing methods predominantly focus either on multi-study integration or multi-modality integration, rendering them insufficient for analyzing the diverse modalities measured across multiple studies. To address this limitation and cater to practical needs, we introduce a high-dimensional generalized factor model that seamlessly integrates multi-modality data from multiple studies, while also accommodating additional covariates. We conduct a thorough investigation of the identifiability conditions to enhance the model's interpretability. To tackle the complexity of high-dimensional nonlinear integration caused by four large latent random matrices, we utilize a variational lower bound to approximate the observed log-likelihood by employing a variational posterior distribution. By profiling the variational parameters, we establish the asymptotical properties of estimators for model parameters using M-estimation theory. Furthermore, we devise a computationally efficient variational EM algorithm to execute the estimation process and a criterion to determine the optimal number of both study-shared and study-specific factors. Extensive simulation studies and a real-world application show that the proposed method significantly outperforms existing methods in terms of estimation accuracy and computational efficiency. The R package for the proposed method is publicly accessible at https://CRAN.R-project.org/package=MMGFM.

笔记与分组