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GP-BART: A novel Bayesian additive regression trees approach using Gaussian processes

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  • Maia, Mateus
  • Murphy, Keefe
  • Parnell, Andrew C.

Abstract

The Bayesian additive regression trees (BART) model is an ensemble method extensively and successfully used in regression tasks due to its consistently strong predictive performance and its ability to quantify uncertainty. BART combines “weak” tree models through a set of shrinkage priors, whereby each tree explains a small portion of the variability in the data. However, the lack of smoothness and the absence of an explicit covariance structure over the observations in standard BART can yield poor performance in cases where such assumptions would be necessary. The Gaussian processes Bayesian additive regression trees (GP-BART) model is an extension of BART which addresses this limitation by assuming Gaussian process (GP) priors for the predictions of each terminal node among all trees. The model's effectiveness is demonstrated through applications to simulated and real-world data, surpassing the performance of traditional modelling approaches in various scenarios.

Suggested Citation

  • Maia, Mateus & Murphy, Keefe & Parnell, Andrew C., 2024. "GP-BART: A novel Bayesian additive regression trees approach using Gaussian processes," Computational Statistics & Data Analysis, Elsevier, vol. 190(C).
    • Handle: RePEc:eee:csdana:v:190:y:2024:i:c:s016794732300169x
    DOI: 10.1016/j.csda.2023.107858
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    References listed on IDEAS

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