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Metrika

pp 1–44 | Cite as

Kernel density estimation from complex surveys in the presence of complete auxiliary information

  • Sayed A. MostafaEmail author
  • Ibrahim A. Ahmad
Article

Abstract

Auxiliary information is widely used in survey sampling to enhance the precision of estimators of finite population parameters, such as the finite population mean, percentiles, and distribution function. In the context of complex surveys, we show how auxiliary information can be used effectively in kernel estimation of the superpopulation density function of a given study variable. We propose two classes of “model-assisted” kernel density estimators that make efficient use of auxiliary information. For one class we assume that the functional relationship between the study variable Y and the auxiliary variable X is known, while for the other class the relationship is assumed unknown and is estimated using kernel smoothing techniques. Under the first class, we show that if the functional relationship can be written as a simple linear regression model with constant error variance, the mean of the proposed density estimator will be identical to the well-known regression estimator of the finite population mean. If we drop the intercept from the linear model and allow the error variance to be proportional to the auxiliary variable, the mean of the proposed density estimator matches the ratio estimator of the finite population mean. The properties of the new density estimators are studied under a combined design-model-based inference framework, which accounts for the underlying superpopulation model as well as the randomization distribution induced by the sampling design. Moreover, the asymptotic normality of each estimator is derived under both design-based and combined inference frameworks when the sampling design is simple random sampling without replacement. For the practical implementation of these estimators, we discuss how data-driven bandwidth estimators can be obtained. The finite sample properties of the proposed estimators are addressed via simulations and an example that mimics a real survey. These simulations show that the new estimators perform very well compared to standard kernel estimators which do not utilize the auxiliary information.

Keywords

Auxiliary information Combined inference Complex survey data Kernel density estimation 

Mathematics Subject Classification

62D05 62G08 

Notes

Acknowledgements

The authors are grateful to the Editor and two anonymous referees for their insightful comments and suggestions which helped to improve this paper.

Compliance with ethical standards

Conflict of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

Supplementary material

184_2018_703_MOESM1_ESM.pdf (181 kb)
Supplementary material 1 (pdf 180 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of StatisticsIndiana UniversityBloomingtonUSA
  2. 2.Department of MathematicsNorth Carolina A&T State UniversityGreensboroUSA
  3. 3.Department of StatisticsOklahoma State UniversityStillwaterUSA

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