182****44632026-08-29 14:28:22
请问如何得出conclusion1是不对的?
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Essie2026-08-31 10:30:09
同学你好,案例中说了:“After reviewing the time-series data, Martinez determines that the mean and variance of the time series of oil prices are not constant over time.”
均值和方差不平稳说明时间序列数据是非协方差平稳的。
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