Descripción del proyecto
Herramientas econométricas para analizar la heterogeneidad en modelos de redes sociales
La multitud de aplicaciones de redes sociales ha convertido el análisis de las interacciones sociales en un área clave de interés para la investigación. Los patrones de interacción de las personas proporcionan información sobre cómo se influyen entre sí. Los modelos basados en agentes se emplean comúnmente para analizar este tipo de redes sociales. La red se construye de abajo arriba, asignando atributos a entidades autónomas de decisión denominadas agentes, que son, por naturaleza, heterogéneas. Tener en cuenta la heterogeneidad no observada constituye un reto, un proceso limitado por problemas de identificación, estimación y cálculo. El proyecto financiado con fondos europeos NETWORK desarrollará un nuevo método no paramétrico que aborde estos tres problemas. Sus herramientas econométricas describirán cómo un cambio en un atributo de un individuo afecta los atributos de otros individuos, teniendo en cuenta la heterogeneidad no observada a través de un enfoque de efectos aleatorios.
Objetivo
The overarching goal of this project is to develop a coherent set of econometric methods to deal with unobserved heterogeneity in the analysis of social interactions between agents. Such heterogeneity is well recognized to be important. It is often of great interest to document the degree of heterogeneity, evaluate its impact, and uncover the existence and form of any complementarities that may exist between agents. With the growing availability of network data, questions of this kind are increasingly being asked in applied work. The development of appropriate econometric tools to answer them has, however, not followed suit. If anything, recent theoretical work has pointed at substantial difficulties with the so called fixed-effect approach currently serving as the workhorse tool.
This project recognizes the potential of taking a random-effect view. For settings where agents interact in pairs, such a view has received some attention in the literature. However, to date, it struggles with issues of identification, estimation, and computation. We will develop a new nonparametric approach that provides a solution to each of these three issues. We will next venture forward and extend this framework to situations where agents interact in larger groups. Both collaborative and non-collaborative settings will be considered, thereby covering team production, competition, and peer effects. Special attention will be given to recovering treatment effects in the presence of social interactions, where interference on unobservable confounders is an issue. For situations where data limitations prevent a fully nonparametric approach, instrumental-variable methods that build on flexible functional form restrictions will be developed. The statistical properties of the proposed estimators will be derived, software implementation will be provided, and empirical illustrations will be presented to highlight the usefulness of the methods.
Ámbito científico
Palabras clave
Programa(s)
- HORIZON.1.1 - European Research Council (ERC) Main Programme
Régimen de financiación
HORIZON-ERC - HORIZON ERC GrantsInstitución de acogida
31080 Toulouse
Francia