Longitudinal data is becoming increasingly common in business, social sciences, and biological sciences due to the advantages it offers over cross-section data in modeling and incorporating heterogeneity among subjects and in being able to make causal inferences from observational data. Parametric models and methods are widely used for analyzing longitudinal data for continuous, discrete, and c...

This paper proposes a solution to the problem of endogenous selection peers in linear-in-means model. We do not require specify model for how comes about. Rather, we exploit two restrictions that are inherent many such specifications construct conditional moment conditions. The question link decisions involve given individual all independent one another, but they made between other pairs indivi...