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海涛 · 2024年09月09日

翻译

NO.PZ2019040801000060

问题如下:

The following statements are about the autoregressive moving average process. Which of them is correct?

I. It combines the lagged unobservable random shock of the MA process with the observed lagged time series of the AR process.

II. It involves autocorrelations which decay gradually.

选项:

A.

I only.

B.

II only.

C.

Both I and II.

D.

Neither I nor II.

解释:

C is correct.

考点:Autoregressive Moving Average Process

解析:这两个结论都是正确的,是autoregressive moving average process的性质。

看不懂这个题,能翻译一下吗

1 个答案
已采纳答案

pzqa27 · 2024年09月10日

嗨,努力学习的PZer你好:


题目问以下是关于ARMA的陈述。哪种说法是正确的?


I. 它将 MA 过程的滞后不可观测随机冲击与 AR 过程的观测滞后时间序列相结合。


II. 它涉及逐渐衰减的自相关性。


这2个都是对的,AR公式里那个随机项服从WN(0,σ^2),这个是MA process里的随机冲击;然后observed time series对应的就是公式里的

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努力的时光都是限量版,加油!

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