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Fusion Learning of Functional Linear Regression with Application to Genotype-by-Environment Interaction Studies

Author

Listed:
  • Shan Yu

    (University of Virginia)

  • Aaron M. Kusmec

    (Iowa State University)

  • Li Wang

    (George Mason University)

  • Dan Nettleton

    (Iowa State University)

Abstract

We propose a sparse multi-group functional linear regression model to simultaneously estimate multiple coefficient functions and identify groups, such that coefficient functions are identical within groups and distinct across groups. By borrowing information from relevant subgroups of subjects, our method enhances estimation efficiency while preserving heterogeneity in model parameters and coefficient functions. We use an adaptive fused lasso penalty to shrink coefficient estimates to a common value within each group. We also establish theoretical properties of the proposed estimators. To enhance computation efficiency and incorporate neighborhood information, we propose to use graph-constrained adaptive lasso with a computationally efficient algorithm. Two Monte Carlo simulation studies have been conducted to study the finite-sample performance of the proposed method. The proposed method is applied to sorghum flowering-time data and hybrid maize grain yields from the Genomes to Fields consortium. Supplementary materials accompanying this paper appear online.

Suggested Citation

  • Shan Yu & Aaron M. Kusmec & Li Wang & Dan Nettleton, 2023. "Fusion Learning of Functional Linear Regression with Application to Genotype-by-Environment Interaction Studies," Journal of Agricultural, Biological and Environmental Statistics, Springer;The International Biometric Society;American Statistical Association, vol. 28(3), pages 401-422, September.
    • Handle: RePEc:spr:jagbes:v:28:y:2023:i:3:d:10.1007_s13253-023-00529-2
    DOI: 10.1007/s13253-023-00529-2
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    References listed on IDEAS

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