适度网络模型
Moderated Network Models
摘要:
成对网络模型(如高斯图形模型(GGM))是分析多变量数据中依赖关系的强大而直观的方法。GGM的一个关键假设是每个成对相互作用独立于所有其他变量的值。然而,在心理学研究中,这往往是令人难以置信的。在本文中,我们扩展了GGM允许两个变量之间的每一个成对的相互作用,以调节模型中的所有其他变量(的子集),从而引入一个适度的网络模型(MNM)。我们展示了如何构建MNM,并提出了一个L1正则化nodewise回归方法来估计它。我们提供了一个模拟研究中的性能结果,并表明MNM优于分裂样本的方法网络比较测试(NCT)和融合图形套索(FGL)在检测缓和效果。最后,我们提供了一个关于如何使用R包mgm估计MNM的完全可重现的教程,并讨论了模型错误指定的可能问题。
英文摘要:
Pairwise network models such as the Gaussian Graphical Model (GGM) are a powerful and intuitive way to analyze dependencies in multivariate data. A key assumption of the GGM is that each pairwise interaction is independent of the values of all other variables. However, in psychological research this is often implausible. In this paper, we extend the GGM by allowing each pairwise interaction between two variables to be moderated by (a subset of) all other variables in the model, and thereby introduce a Moderated Network Model (MNM). We show how to construct the MNM and propose an L1-regularized nodewise regression approach to estimate it. We provide performance results in a simulation study and show that MNMs outperform the split-sample based methods Network Comparison Test (NCT) and Fused Graphical Lasso (FGL) in detecting moderation effects. Finally, we provide a fully reproducible tutorial on how to estimate MNMs with the R-package mgm and discuss possible issues with model misspecification.
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。