从理论上说，这样等于忽视个体所处的背景环境对个体的影响，不符合社会实际；从 统计上来说，对“群效应”（cluster effect）的忽略会导致对个体变量参数估计的偏差。
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羊群效应 Sheep-Flock Effect ; HERD EFFECT ; The effect of sheep flock ; Herding Effect
同群效应 peer effects
理性的羊群效应 rational herding
惊群效应 thundering herd
群聚效应 Critical mass ; Cluster Effect ; clustering effect
非理性的羊群效应 Irrational Herding ; irrational herd effect
产业集群效应 Industrial cluster effect
群体效应 Quorum Sensing ; group effect ; [植] population effect ; cohort effect
群效应对年龄和电脑的使用之间的关系影响很大。
The relation between age and computer use is strongly influenced by cohort effects.
另外，本文发现，农村老年人居住安排存在着显著的“同群效应”。
Moreover, this paper also finds that there are "peer effects" in the living arrangement in rural China.
是的，上层社会的收入增长部分是由于相关的效应：一小群人能够管理大笔大笔的钱并带回令人瞠目的回报。
And yes, part of the rise in incomes at the very top has been due to a related effect: the ability of a small group of people to manage enormous sums of money and take home eye-popping returns.
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