New Method of Order Estimation for ARMA/ARMAX Processes
New Method of Order Estimation for ARMA/ARMAX Processes
复制标题
ARMA/ARMAX 过程阶次估计的新方法
DOI:
10.1137/090768680
复制
发表时间:
2010-03
影响因子:
2.2
通讯作者:
Zhao, Wen-Xiao
中科院分区:
文献类型:
--
作者:
Chen, Han-Fu;Zhao, Wen-Xiao
Let the observation $\{y_k\}$ be generated by the multivariate ARMA process $A(z)y_k=C(z)w_k$ with unknown coefficients $\theta_A$, $\theta_C$ and orders $(p,r)$, where $\{w_k\}$ is a sequence of independent and identically distributed (i.i.d.) random vectors with zero mean and unknown covariance matrix $R_w>0$. A new method for estimating the orders $(p,r)$ is introduced. In contrast to most of the existing results, the new method is not based on optimizing a certain criterion, and the order estimates given in the paper are rather easy to update computationally in comparison with the criterion-optimization-based methods when new data arrive. The method is then extended to determining the orders of ARMAX processes. Under reasonable conditions the estimates are proved to converge to the true orders with probability one as time tends to infinity.
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