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arXiv · 2610.40163

Model-assisted estimation of the finite population mean via local linear regression with associated kernels

Sobom M. Somé·Idrissa Dimzouré
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Abstract

In this paper, we propose a general regression-assisted estimator of the population mean based on local regression with associated kernels, a broad class that encompasses both classical (symmetric) kernels, such as the Gaussian and Epanechnikov kernels, and asymmetric kernels, such as the gamma kernel. We establish the asymptotic properties of the proposed estimator, including explicit expressions for the bias, mean squared error, and asymptotic normality, under a unified framework that applies to any kernel in this class. Through simulation studies on nonnegative data and one real-data application, we compare the finite-sample performance of the estimator based on the gamma kernel with those relying on the Gaussian and Epanechnikov kernels. When the data are supported on the positive real line, symmetric kernels suffer from boundary bias near zero due to mass assignment outside the support, whereas the gamma kernel, naturally adapted to $[0,\infty)$, alleviates this effect. The results confirm that the choice of kernel within the associated matters in practice, and that asymmetric kernels provide a reliable and efficient alternative when the underlying regression function is supported on the positive real line or exhibits marked asymmetry.

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Sobom M. Somé, Idrissa Dimzouré. 2026-10-29. Model-assisted estimation of the finite population mean via local linear regression with associated kernels. https://arxiv.org/abs/2610.40163

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