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基于Edgeworth级数的行程时间可靠性的计算与实证

, PP. 127-133

Keywords: 交通工程,行程时间可靠性,Edgeworth级数,路段,分布规律

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Abstract:

通过引入行程时间可靠性概念,研究因受交通事故、交通供需矛盾等因素的影响,而导致路网行程时间随机波动的现象。为了研究路段中行程时间的分布规律,基于连续3个月的历史行程时间数据,实证分析了几个典型时间窗的行程时间分布形态,对高峰时段的数据拟合正态分布,平峰时段的数据拟合对数正态分布。同时,对大多数不服从常用理论分布函数的路段行程时间,使用Edgeworth渐进级数来近似其概率密度函数和分布函数,进而构建出相应的路段行程时间可靠性的计算模型。最后,结合高峰时段实证数据计算路段行程时间可靠性,并将其与基于正态分布计算出来的行程时间可靠性进行比较,实证结果表明基于Edgeworth级数估计的行程时间可靠性明显优于正态分布,且该方法具有较好的移植性。

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