• 3方差专业定义随机变量二次中心期望值平方加权平均

    The technical definition of variance is the random variable's second central moment, the weighted average of the square of the differences from the expected value.

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  • 第一模型中,假定出行者广义出行费用定义为平均行程时间行程时间均方差线性加权和,同时出行者能够正确认识自己的广义出行费用。

    In the first model users' generalized travel cost are assumed to be weighted sum of the standard deviation and the mean travel time, and users have perfect knowledge of the road network condition.

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  • 第一模型中,假定出行者广义出行费用定义为平均行程时间行程时间均方差线性加权和,同时出行者能够正确认识自己的广义出行费用。

    In the first model users' generalized travel cost are assumed to be weighted sum of the standard deviation and the mean travel time, and users have perfect knowledge of the road network condition.

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