Network Varying Coefficient Model
网络变系数模型AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要以网络节点潜在位置驱动回归系数变化,直接涉及网络数据建模。
网络变系数模型AI 解读 ↓
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We propose a novel network-varying coefficient model that extends traditional varying coefficient models to accommodate network data. The main idea is to model the regression coefficients as the functions of the latent “locations” of network nodes that drive formation of the network. To estimate the model, we identify the latent “locations” via the latent space model and then develop an iterative projected gradient descent algorithm by optimizing the network parameters and regression coefficients alternately. The non-asymptotic bounds of the estimated coefficient matrix are obtained. In addition, a Bayesian information criterion is proposed to select the dimension of the latent space. Moreover, we employ a penalized method to select covariates with varying coefficients that are significant to the response variable, and demonstrate the theoretical properties of selection. The utility of the proposed model is illustrated via simulation studies and a real-world application in the field of finance by analyzing the relationship between stock returns and their corresponding financial ratios from a network perspective. Supplementary materials for this article are available online, including a standardized description of the materials available for reproducing the work.