老师的描述是 it seems it is a random walk. The PAC decay slowly. The first coefficient is large but the second and beyond AC coefficient decay to 0 quite rapidly.
但是为啥我看图觉得是AC decay slowly & PAC decay rapidly?
求大家指点这种图到底怎么看啊。。。谢谢大家噜~~~
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楼主: Aaaathena
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[时间序列问题] 用ac和pac进行arima模型的识别问题!! |
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