After removing the long-term tendency, cyclical fluctuating and seasonal fluctuating one by one from Baltic Freight Index, a null means stationary series is reached which matched ARMA model.
对波罗的海运价指数分别提取长期趋势项、周期波动项和季节波动项以后，得到了一个符合ARMA模型建模要求的零均值平稳序列。
参考来源 - 国际干散货运价波动分析及经营策略研究The freight index is the outcome of a complex nonlinear system, so we cannot get sound results by using classical forecasting models.
由于干散货运价指数是由一个内部具有复杂非线性关系的系统生成的结果,因此经典的预测模型方法对运价指数难以取得良好的预测结果。
参考来源 - 小波分析·2,447,543篇论文数据，部分数据来源于NoteExpress
At present, researches on China Container Freight Index forecasting are limited.
当前对中国出口集装箱运价指数的预测研究还比较少。
China Container Freight Index has been regarded by international maritime trade realm.
中国出口集装箱运价指数一直受到国际航运界的关注。
The adding of the three tendencies wholly grasps the fluctuating law of Baltic Freight Index.
三种趋势的叠加在整体上反映了波罗的海运价指数的波动规律。
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