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Dynamic Spatial Panel Models: Networks, Common Shocks, and Sequential Exogeneity
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DOI：10.3982/ECTA13660.png)
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摘要
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This paper considers a class of generalized methods of moments (GMM) estimators for general dynamic panel models, allowing for weakly exogenous covariates and cross-sectional dependence due to spatial lags, unspecified common shocks, and time-varying interactive effects. We significantly expand the scope of the existing literature by allowing for endogenous time-varying spatial weight matrices without imposing explicit structural assumptions on how the weights are formed. An important area of application is in social interaction and network models where our specification can accommodate data dependent network formation. We consider an exemplary social interaction model and show how identification of the interaction parameters is achieved through a combination of linear and quadratic moment conditions. For the general setup we develop an orthogonal forward differencing transformation to aid in the estimation of factor components while maintaining orthogonality of moment conditions. This is an important ingredient to a tractable asymptotic distribution of our estimators. In general, the asymptotic distribution of our estimators is found to be mixed normal due to random norming. However, the asymptotic distribution of our test statistics is still chi-square.
Keyword:
Dynamic spatial panels
social interactions
endogenous networks
time-varying fixed effects
common shocks
generalized methods of moments
central limit theorem for linear-quadratic forms
forward filtering
generalized Helmert transformation
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被引数:
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