A purchase made by signed order, as for a periodical for a specified period of time or for a series of performances.
通过签订购单来买东西，如在某一段时期订阅一期刊，或者订购一系列演出之戏票。
Power function, periodical function, and ARMA model are established according to the characteristics of sub-series.
然后根据各子序列的特性分别建立幂函数、周期函数或ARMA模型并进行预测。
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