A double forecasting model is proposed by using conditional mathematical expectation, based on probability distribution of port cargo throughput.
在得出港口货物吞吐量概率分布的基础上，利用条件数学期望提出了港口货物吞吐量的双层预测模型。
This paper explores the application of conditional expectation in solutions to mathematical expectation and best prediction.
条件数学期望是概率论中一个重要概念，本文通过求数学期望的例子和最优预测探讨了它的应用。
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