以下为句子列表：
英文: Calibrating the gravity model consists of evaluating the parameters of the impedance function (or the values in the friction factor table) so that the gravity model reproduces, as closely as possible, the base year productions and/or attractions and the b
中文: 校准重力模型就是计算阻抗函数参数（或者摩阻系数表中的值），使其尽可能吻合基年产生和吸引，以及基年的出行距离分布。
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英文: Calibration typically entails an iterative process that computes coefficients such that the gravity model replicates the trip length frequency distribution and matches base year productions and/or attractions.
中文: 典型的校准在系数计算中通常有一个迭代过程，好像重力模型复制了出行距离频数分布，同时匹配基年发生和吸引。
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