Efficient Estimation for Varying-Coefficient Mixed Effects Models with Functional Response Data

Xiong Cai, Liugen Xue (), Xiaolong Pu and Xingyu Yan
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Xiong Cai: Beijing University of Technology
Liugen Xue: Beijing University of Technology
Xiaolong Pu: East China Normal University
Xingyu Yan: East China Normal University

Metrika: International Journal for Theoretical and Applied Statistics, 2021, vol. 84, issue 4, No 2, 467-495

Abstract: Abstract In this article, we focus on the estimation of varying-coefficient mixed effects models for longitudinal and sparse functional response data, by using the generalized least squares method coupling a modified local kernel smoothing technique. This approach provides a useful framework that simultaneously takes into account the within-subject covariance and all observation information in the estimation to improve efficiency. We establish both uniform consistency and pointwise asymptotic normality for the proposed estimators of varying-coefficient functions. Numerical studies are carried out to illustrate the finite sample performance of the proposed procedure. An application to the white matter tract dataset obtained from Alzheimer’s Disease Neuroimaging Initiative study is also provided.

Keywords: Functional varying coefficient models; Within-subject correlation; Local kernel smoothing; Efficient estimation; Functional responses (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1007/s00184-020-00776-0

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