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arXiv 2203.03497econ.EM
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具有网络溢出效应的线性二元数据模型中的推断

Inference in Linear Dyadic Data Models with Network Spillovers

Nathan Canen, Ko Sugiura

AI总结:

针对二元数据中网络连接导致“二元稳健”方差估计量偏差的问题,本文利用网络统计学结果开发了一种允许溢出效应衰减的一致方差估计量,并在模拟和欧洲议会投票行为实证中验证了其有效性。

摘要:

在使用二元数据(即以单元对为索引的数据)时,研究人员通常假设一个线性模型,使用普通最小二乘法进行估计,并使用“二元稳健”方差估计量进行推断。后者假设如果二元组不共享公共单元(例如,同一个体不同时存在于两个数据对中),则它们是不相关的。我们表明,这一假设在许多实证应用中并不成立,因为网络连接可能产生间接链接,从而导致相关结果。因此,“二元稳健”估计量在这种情况下可能会产生偏差。我们利用网络统计学的结果,为这类情境开发了一种一致方差估计量。我们的估计量在模拟中具有良好的有限样本性质,同时允许溢出效应衰减。我们通过将我们的观点应用于欧洲议会中议员作为邻座时的投票行为来阐明我们的信息。

英文摘要:

When using dyadic data (i.e., data indexed by pairs of units), researchers typically assume a linear model, estimate it using Ordinary Least Squares and conduct inference using ``dyadic-robust" variance estimators. The latter assumes that dyads are uncorrelated if they do not share a common unit (e.g., if the same individual is not present in both pairs of data). We show that this assumption does not hold in many empirical applications because indirect links may exist due to network connections, generating correlated outcomes. Hence, ``dyadic-robust'' estimators can be biased in such situations. We develop a consistent variance estimator for such contexts by leveraging results in network statistics. Our estimator has good finite sample properties in simulations, while allowing for decay in spillover effects. We illustrate our message with an application to politicians' voting behavior when they are seating neighbors in the European Parliament.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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