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Improved confidence intervals for nonlinear mixed-effects and nonparametric regression models

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  • Nan Zheng

    (Memorial University of Newfoundland)

  • Noel Cadigan

    (Fisheries and Marine Institute of Memorial University of Newfoundland)

Abstract

Statistical inference for high-dimensional parameters (HDPs) can leverage their intrinsic correlations, as spatially or temporally close parameters tend to have similar values. This is why nonlinear mixed-effects models (NMMs) are commonly used for HDPs. Conversely, in many practical applications, the random effects (REs) in NMMs are correlated HDPs that should remain constant during repeated sampling for frequentist inference. In both scenarios, the inference should be conditional on REs, instead of marginal inference by integrating out REs. We summarize recent theory of conditional inference for NMM, and then propose a bias-corrected RE predictor and confidence interval (CI). We also extend this methodology to accommodate the case where some REs are not associated with data. Simulation studies indicate our new approach leads to substantial improvement in the conditional coverage rate of RE CIs, including CIs for smooth functions in generalized additive models, compared to the existing method based on marginal inference.

Suggested Citation

  • Nan Zheng & Noel Cadigan, 2025. "Improved confidence intervals for nonlinear mixed-effects and nonparametric regression models," Annals of the Institute of Statistical Mathematics, Springer;The Institute of Statistical Mathematics, vol. 77(1), pages 105-126, February.
    • Handle: RePEc:spr:aistmt:v:77:y:2025:i:1:d:10.1007_s10463-024-00909-6
    DOI: 10.1007/s10463-024-00909-6
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    References listed on IDEAS

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    1. Simon N. Wood, 2020. "Rejoinder on: Inference and computation with Generalized Additive Models and their extensions," TEST: An Official Journal of the Spanish Society of Statistics and Operations Research, Springer;Sociedad de Estadística e Investigación Operativa, vol. 29(2), pages 354-358, June.
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