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arXiv 2502.00751stat.MEecon.EM
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时间序列的在线广义矩方法

Online Generalized Method of Moments for Time Series

Man Fung Leung, Kin Wai Chan, Xiaofeng Shao

AI总结:

针对大规模流时间序列数据分析需求,提出了在线广义矩方法(OGMM)框架,在继承离线GMM优势的同时大幅提升了时间和内存效率,并改进了相关检验方法,在多种任务与应用中验证了其有效性。

摘要:

近年来,由于迫切需要分析大规模流数据,这些数据可以持续收集且存在序列依赖性,在线学习因此变得流行。这促使我们开发了在线广义矩方法(OGMM),这是一种在时间序列环境下显式更新的估计与推断框架。OGMM继承了离线GMM的许多性质,例如在计量经济学和统计学许多问题中的广泛适用性,对过度识别的自然适应,以及在时间依赖下实现半参数有效性。作为一种在线方法,相对于离线GMM的关键优势是时间复杂度和内存需求的极大改善。基于OGMM框架,我们提出了改进版本的在线Sargan--Hansen检验和结构稳定性检验,这些检验遵循了计量经济学和统计学的最新研究。通过蒙特卡洛模拟,我们观察到在线工具变量回归、在线过度识别约束检验、在线分位数回归和在线异常检测中令人鼓舞的有限样本表现。我们还展示了OGMM在随机波动率建模和惯性传感器校准中的有趣应用,以证明OGMM的有效性。

英文摘要:

Online learning has gained popularity in recent years due to the urgent need to analyse large-scale streaming data, which can be collected in perpetuity and serially dependent. This motivates us to develop the online generalized method of moments (OGMM), an explicitly updated estimation and inference framework in the time series setting. The OGMM inherits many properties of offline GMM, such as its broad applicability to many problems in econometrics and statistics, natural accommodation for over-identification, and achievement of semiparametric efficiency under temporal dependence. As an online method, the key gain relative to offline GMM is the vast improvement in time complexity and memory requirement. Building on the OGMM framework, we propose improved versions of online Sargan--Hansen and structural stability tests following recent work in econometrics and statistics. Through Monte Carlo simulations, we observe encouraging finite-sample performance in online instrumental variables regression, online over-identifying restrictions test, online quantile regression, and online anomaly detection. Interesting applications of OGMM to stochastic volatility modelling and inertial sensor calibration are presented to demonstrate the effectiveness of OGMM.

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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