A Method for Autoregressive-Moving Average Estimation
自回归移动平均模型的一种估计方法AI 解读 ↓
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自回归移动平均模型的一种估计方法AI 解读 ↓
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The problem considered is that of estimating an autoregressive-moving average system, including estimating the degrees of the autoregressive and moving average lag operators. The basic method is that introduced by Hannan & Rissanen (1982). However, that method may sometimes overestimate the degrees and modifications are here introduced to correct this. The problem is itself due to the use of a long autoregression, of order clogT when T is large, in the first stage of the process. The effect of this is investigated and in particular its effect on the speed of convergence of the estimates.