ESTIMATION OF TREND IN STATE-SPACE MODELS: ASYMPTOTIC MEAN SQUARE ERROR AND RATE OF CONVERGENCE

• 成果类型: Article
• 署名作者: Burman, Prabir; Shumway, Robert H.
• 署名单位: University of California System; University of California Davis
• 刊物名称: ANNALS OF STATISTICS
• ISSN/ISSBN: 0090-5364
• DOI: 10.1214/08-AOS675
• 发表日期: 2009
• 页码: 3715-3742
• 关键词: regression

摘要

The focus of this paper is on trend estimation for a general state-space model Y-t = mu(t) + epsilon(t), where the dth difference of the trend {mu(t)} is assumed to be i.i.d., and the error sequence {epsilon(t)} is assumed to be a mean zero stationary process. A fairly precise asymptotic expression of the mean square error is derived for the estimator obtained by penalizing the dth order differences. Optimal rate of convergence is obtained, and it is shown to be asymptotically equivalent to a nonparametric estimator of a fixed trend model of smoothness of order d - 0.5. The results of this paper show that the optimal rate of convergence for the stochastic and nonstochastic cases are different. A criterion for selecting the penalty parameter and degree of difference d is given, along with an application to the global temperature data, which shows that a longer term history has nonlinearities that are important to take into consideration.