在小说阅读器读本章去阅读在小说阅读器中沉浸阅读 研究院黄丹阳教授及合作者在期刊《Journal of Econometrics》发表论文。该研究聚焦于空间计量与社会网络分析中的多元空间自回归(MSAR)模型。针对高维响应情形下参数数量随响应变了维度平方增长、模型复杂度显著提升的问题,研究在空间影响矩阵中引入低秩结构,提出了一种降秩MSAR模型,在实现有效降维的同时增强了模型的可解释性。为降低准极大似然估计(QMLE)的计算成本,进一步构建了最小二乘估计(LSE)方法,并在网络规模与响应维度同时趋于无穷的框架下建立了其渐近理论。针对秩的选择问题,研究提出了基于信息准则的估计方法,并证明了其选择一致性。数值模拟结果表明,所提出模型与估计方法具有良好的有限样本表现。最后,基于国内大型聚合支付平台的实证分析进一步验证了模型的实际应用价值。
Reduced rank multivariate spatial autoregressive model for large-scale networks
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论文摘要
In spatial and social network analysis, multivariate spatial autoregressive (MSAR) models are effective tools for analyzing network data with multivariate responses. When the dimension of the response is divergent, however, the number of unknown parameters in an MSAR increases at a rate that is proportional to the square of the dimensionality, which poses significant challenges to the model estimation process. To address this issue, we propose a novel reduced-rank MSAR model by imposing a low-rank structure on the spatial influence matrix of the multivariate responses. The proposed model achieves substantial dimensionality reduction and offers insightful interpretations. To mitigate the high computational cost of the quasi-maximum likelihood estimator (QMLE), we propose a least squares estimator (LSE) for estimating the unknown parameters. Furthermore, we establish the asymptotic nature of the LSE when both the network size and the dimensionality of the responses diverge to infinity. To determine the rank, we propose an information criterion estimator and demonstrate the consistency of its rank selection process. Extensive numerical simulations validate the proposed model and parameter estimates. Finally, a dataset derived from Shouqianba, one of the largest aggregate payment platforms, is analyzed for illustration purposes.