论文标题
同伴效应和内源社交互动
Peer effects and endogenous social interactions
论文作者
论文摘要
我们介绍了一种处理线性模型中同龄人自我选择的方法。与现有的建议相反，我们不需要为同行选择的方式指定模型。相反，我们利用了许多此类规格固有的两个限制来构建直观的仪器变量。这些限制是涉及给定个人的链接决策并非全部彼此独立，而是独立于其他成对个人之间的链接行为。然后很容易获得线性均值模型的两阶段最小二乘估计器。
We introduce an approach to deal with self-selection of peers in the linear-in-means model. Contrary to the existing proposals we do not require to specify a model for how the selection of peers comes about. Rather, we exploit two restrictions that are inherent to many such specifications to construct intuitive instrumental variables. These restrictions are that link decisions that involve a given individual are not all independent of one another, but that they are independent of the link behavior between other pairs of individuals. A two-stage least-squares estimator of the linear-in-means model is then readily obtained.
