[img]file:///C:\Users\cherrymessing\Documents\Tencent Files\601073050\Image\C2C\V1D)OO79NH9[E58`T~H64_9.png[/img][img=0,1]file:///C:\Users\cherrymessing\Documents\Tencent Files\601073050\Image\C2C\V1D)OO79NH9[E58`T~H64_9.png[/img][img=0,1]file:///C:\Users\cherrymessing\Documents\Tencent Files\601073050\Image\C2C\V1D)OO79NH9[E58`T~H64_9.png[/img] 这是一个平稳时间拖尾序列的自相关和偏自相关图，求哪位大神看看这到底是截尾还是一个拖尾，还有怎么确定ARMA模型，因为这是对单一变量做的图，还请帮帮忙，不胜感激