Efficient estimation of regression models with user-specified parametric model for heteroskedasticity*
用户指定异方差参数模型下的回归有效估计AI 解读 ↓
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用户指定异方差参数模型下的回归有效估计AI 解读 ↓
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We show that it is possible to estimate regression coefficients at least as precisely as Ordinary Least Squares (OLS), Weighted Least Squares (WLS) and its recently proposed refinements, regardless of the user’s parametric model for heteroskedasticity. The key is to modify WLS depending on scalar target parameters, e.g., coefficients, marginal effects, predictions, etc. to obtain a targeted WLS that maximizes precision of estimation of the target given the user’s model for heteroskedasticity. By construction, targeting improves precision over other estimators when the user’s model is incorrect, and maintains semiparametric efficiency when it is correct. When the user’s model is incorrect, targeted WLS can be improved by targeted combination of WLS and OLS building on the literature on “resurrecting WLS”. Our targeted estimators are parametric and based on robust variance estimation. They are asymptotically optimal in important classes of estimators and show big improvements over others in simulations.