A Simple Formula for Mixing Estimators With Different Convergence Rates
混合不同收敛速度估计量的简明公式AI 解读 ↓
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混合不同收敛速度估计量的简明公式AI 解读 ↓
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Suppose that two estimators, θ^S,n and θ^N,n, are available for estimating an unknown parameter θ, and are known to have convergence rates n1/2 and rn = o(n1/2), respectively, based on a sample of size n. Typically, the more efficient estimator θ^S,n is less robust than θ^N,n, and a definitive choice cannot be easily made between them under practical circumstances. We propose a simple mixture estimator, in the form of a linear combination of θ^S,n and θ^N,n, which successfully reaps the benefits of both estimators. We prove that the mixture estimator possesses a kind of oracle property so that it captures the fast n1/2 convergence rate of θ^S,n when conditions are favorable, and is at least rn-consistent otherwise. Applications of the mixture estimator are illustrated with examples drawn from different problem settings including orthogonal function regression, local polynomial regression, density derivative estimation, and bootstrap inferences for possibly dependent data.