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A reproducing kernel Hilbert space approach to high dimensional partially varying coefficient model

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  • Lv, Shaogao
  • Fan, Zengyan
  • Lian, Heng
  • Suzuki, Taiji
  • Fukumizu, Kenji

Abstract

Partially varying coefficient model (PVCM) provides a useful class of tools for modeling complex data by incorporating a combination of constant and time-varying covariate effects. One natural question is that how to decide which covariates correspond to constant coefficients and which correspond to time-dependent coefficient functions. To handle this two-type structure selection problem on PVCM, those existing methods are either based on a finite truncation way of coefficient functions, or based on a two-phase procedure to estimate the constant and function parts separately. This paper attempts to provide a complete theoretical characterization for estimation and structure selection issues of PVCM, via proposing two new penalized methods for PVCM within a reproducing kernel Hilbert space (RKHS). The proposed strategy is partially motivated by the so-called “Non-Constant Theorem” of radial kernels, which ensures a unique and unified representation of each candidate component in the hypothesis space. Within a high-dimensional framework, minimax convergence rates for the prediction risk of the first method is established when each unknown time-dependent coefficient can be well approximated within a specified RKHS. On the other hand, under certain regularity conditions, it is shown that the second proposed estimator is able to identify the underlying structure correctly with high probability. Several simulated experiments are implemented to examine the finite sample performance of the proposed methods.

Suggested Citation

  • Lv, Shaogao & Fan, Zengyan & Lian, Heng & Suzuki, Taiji & Fukumizu, Kenji, 2020. "A reproducing kernel Hilbert space approach to high dimensional partially varying coefficient model," Computational Statistics & Data Analysis, Elsevier, vol. 152(C).
    • Handle: RePEc:eee:csdana:v:152:y:2020:i:c:s0167947320301304
    DOI: 10.1016/j.csda.2020.107039
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    References listed on IDEAS

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    1. Jingyuan Liu & Runze Li & Rongling Wu, 2014. "Feature Selection for Varying Coefficient Models With Ultrahigh-Dimensional Covariates," Journal of the American Statistical Association, Taylor & Francis Journals, vol. 109(505), pages 266-274, March.
    2. Jianhua Z. Huang, 2002. "Varying-coefficient models and basis function approximations for the analysis of repeated measurements," Biometrika, Biometrika Trust, vol. 89(1), pages 111-128, March.
    3. Jianqing Fan & Yunbei Ma & Wei Dai, 2014. "Nonparametric Independence Screening in Sparse Ultra-High-Dimensional Varying Coefficient Models," Journal of the American Statistical Association, Taylor & Francis Journals, vol. 109(507), pages 1270-1284, September.
    4. Yang, Lijian & Park, Byeong U. & Xue, Lan & Hardle, Wolfgang, 2006. "Estimation and Testing for Varying Coefficients in Additive Models With Marginal Integration," Journal of the American Statistical Association, American Statistical Association, vol. 101, pages 1212-1227, September.
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