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Bootstrapping binary GEV regressions for imbalanced datasets

Author

Listed:
  • Michele Rocca

    (University of Salerno)

  • Marcella Niglio

    (University of Salerno)

  • Marialuisa Restaino

    (University of Salerno)

Abstract

This paper proposes and discusses a bootstrap scheme to make inferences when an imbalance in one of the levels of a binary variable affects both the dependent variable and some of the features. Specifically, the imbalance in the binary dependent variable is managed by adopting an asymmetric link function based on the quantile of the generalized extreme value (GEV) distribution, leading to a class of models called GEV regression. Within this framework, we propose using the fractional-random-weighted (FRW) bootstrap to obtain confidence intervals and implement a multiple testing procedure to identifying the set of relevant features. The main advantages of FRW bootstrap are as follows: (1) all observations belonging to the imbalanced class are always present in every bootstrap resample; (2) the bootstrap can be applied even when the complexity of the link function does not allow to easily compute second-order derivatives for the Hessian; (3) the bootstrap resampling scheme does not change whatever the link function is, and can be applied beyond the GEV link function used in this study. The performance of the FRW bootstrap in GEV regression modelling is evaluated using a detailed Monte Carlo simulation study, where the imbalance is present in the dependent variable and features. An application of the proposed methodology to a real dataset to analyze student churn in an Italian university is also discussed.

Suggested Citation

  • Michele Rocca & Marcella Niglio & Marialuisa Restaino, 2024. "Bootstrapping binary GEV regressions for imbalanced datasets," Computational Statistics, Springer, vol. 39(1), pages 181-213, February.
    • Handle: RePEc:spr:compst:v:39:y:2024:i:1:d:10.1007_s00180-023-01330-y
    DOI: 10.1007/s00180-023-01330-y
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    References listed on IDEAS

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