The effects of dynamic feedbacks on LS and MM estimator accuracy in panel data models
动态反馈对面板模型 LS 与矩估计精度的影响AI 解读 ↓
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动态反馈对面板模型 LS 与矩估计精度的影响AI 解读 ↓
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The finite sample behaviour is analysed of particular least squares (LS) and a range of (generalized) method of moments (MM) estimators in panel data models with individual effects and both a lagged dependent variable regressor and another explanatory variable. The latter may be affected by lagged feedbacks from the de- pendent variable too. Asymptotic expansions indicate how the order of magnitude of bias of MM estimators tends to increase with the number of moment condi- tions exploited. They also provide analytic evidence on how the bias of the various estimators depends on the feedbacks and on other model characteristics such as prominence of individual effects and correlation between observed and unobserved heterogeneity. Simulation results corroborate the theoretical findings and reveal that in small samples of models with dynamic feedbacks none of the techniques ex- amined dominates regarding bias and mean squared error over all parametrizations examined.