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关注：1
2013-05-23 12:21
求翻译：Both the mean level and time-trend vanish after the second difference. △2Zt is to study the acceleration of the Zt process.是什么意思？ 待解决
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- 离问题结束还有
Both the mean level and time-trend vanish after the second difference. △2Zt is to study the acceleration of the Zt process.
问题补充： |
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