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关注：1
2013-05-23 12:21
求翻译：如果一个时间序列的均值或自协方差函数随时间而改变，那么这个序列就是非平稳序列。是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
如果一个时间序列的均值或自协方差函数随时间而改变，那么这个序列就是非平稳序列。
问题补充： |
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2013-05-23 12:21:38
If a time series of mean or autocovariance function change over time, then the sequence is non-stationary series.
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2013-05-23 12:23:18
If a time series of value both parties or poor function since HS change over time, then this escape sequence is non-smooth sequence.
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2013-05-23 12:24:58
If a time series average value or the autocovariance function change along with the time, then this sequence is the non-steady sequence.
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2013-05-23 12:26:38
If the mean value of a time series or auto-covariance function change over time, then the sequence is non-stationary series.
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2013-05-23 12:28:18
If the mean value or auto-covariance function of a time array changes with time, then this array is a non- steady array.
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