正是据以将大总体划分为几个匀质组（homogeneous groups）的依据，判断样本才具有代表性。既然我们希望通过样本来了解的问题，可以将总体划分为能用一些个体来代表的几个子总体（specific...
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Then risk-homogeneous groups are formed and they are also return-homogeneous groups.
而这些风险同质组恰好又是回报同质组。
Member contributions tend to be more equal in homogeneous groups and members are more committed to the group than members in heterogeneous groups.
与异质群体的成员相比，同质群体的成员对群体的贡献更为均衡，对群体也更忠诚。
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