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arXiv 2303.11892stat.MEstat.AP
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稀疏动态因子模型:正则化的拟极大似然方法

The Sparse Dynamic Factor Model: A Regularised Quasi-Maximum Likelihood Approach

Luke Mosley, Tak-Shing T. Chan, Alex Gibberd

摘要:

稀疏性和正则化估计的概念已被证明在许多高维统计应用中是有用的。动态因子模型为高维时间序列的建模提供了一种简洁的方法,但往往难以解释潜在因子的含义。本文正式介绍了一类稀疏的DFM,其中的加载矩阵被限制为有几个非零的项目,从而增加了可解释的因素。我们提出了一个正则化的M-估计模型参数,并构建了一个有效的期望最大化算法,使估计。合成实验表明,在估计负载结构方面的一致性,以及在低秩因子结构可能是适当的情况下的优越预测性能。该方法的实用性进一步说明了在一个应用程序中预测跨一个大的智能电表集的电力消耗。

英文摘要:

The concepts of sparsity, and regularised estimation, have proven useful in many high-dimensional statistical applications. Dynamic factor models (DFMs) provide a parsimonious approach to modelling high-dimensional time series, however, it is often hard to interpret the meaning of the latent factors. This paper formally introduces a class of sparse DFMs whereby the loading matrices are constrained to have few non-zero entries, thus increasing interpretability of factors. We present a regularised M-estimator for the model parameters, and construct an efficient expectation maximisation algorithm to enable estimation. Synthetic experiments demonstrate consistency in terms of estimating the loading structure, and superior predictive performance where a low-rank factor structure may be appropriate. The utility of the method is further illustrated in an application forecasting electricity consumption across a large set of smart meters.

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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