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- UID
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- 2011-7-11
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- 2016-4-19
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| Covariance stationary means that the mean of the time series is constant. If it's sloping upwards, it's not constant. It's not so much a problem as something that can be easily remedied by differencing the time series or fitting the trend. |
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发表于 2011-7-11 19:56
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