通常的例子，汇总数据的平均数，中位数和模式，而更复杂的标准偏差和泊松分布。
The usual examples of aggregated data are average, median and mode while the more complicated are standard deviation and Poisson distribution.
依据实际测量数据，论证了平面交叉口绿灯转红灯时车流堵塞波的推进速度满足正态分布假设，其拟合优度高于泊松分布假设。
It is showed that a shock wave speed distribution in red light period at a plane intersection satisfies a normal assumption, as well as Poisson assumption.
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