A Class of Non‐Embeddable ARMA Processes
A Class of Non‐Embeddable ARMA Processes
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一类非嵌入式 ARMA 进程
DOI:
10.1111/1467-9892.00151
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发表时间:
1999
影响因子:
0.9
通讯作者:
P. Brockwell
中科院分区:
文献类型:
--
作者:
A. Brockwell;P. Brockwell
We show that a stationary ARMA(p, q) process {Xn = 0, 1, 2, ...} whose moving‐average polynomial has a root on the unit circle cannot be embedded in any continuous‐time autoregressive moving‐average (ARMA) process {Y}(t), t≥ 0}, i.e. we show that it is impossible to find a continuous‐time ARMA process {Y}(t)} whose autocovariance function at integer lags coincides with that of {Xn}. This provides an answer to the previously unresolved question raised in the papers of Chan and Tong (J. Time Ser. Anal. 8 (1987), 277–81), He and Wang (J. Time Ser. Anal. 10 (1989), 315–23) and Brockwell (J. Time Ser. Anal. 16 (1995), 451–60).