Spatial Confounding and Spatial+ for Nonlinear Covariate Effects

Emiko Dupont () and Nicole H. Augustin
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Emiko Dupont: University of Bath
Nicole H. Augustin: University of Edinburgh

Journal of Agricultural, Biological and Environmental Statistics, 2024, vol. 29, issue 3, No 3, 455-470

Abstract: Abstract Regression models for spatially varying data use spatial random effects to reflect spatial correlation structure. Such random effects, however, may interfere with the covariate effect estimates and make them unreliable. This problem, known as spatial confounding, is complex and has only been studied for models with linear covariate effects. However, as illustrated by a forestry example in which we assess the effect of soil, climate, and topography variables on tree health, the covariate effects of interest are in practice often unknown and nonlinear. We consider, for the first time, spatial confounding in spatial models with nonlinear effects implemented in the generalised additive models (GAMs) framework. We show that spatial+, a recently developed method for alleviating confounding in the linear case, can be adapted to this setting. In practice, spatial+ can then be used both as a diagnostic tool for investigating whether covariate effect estimates are affected by spatial confounding and for correcting the estimates for the resulting bias when it is present. Supplementary materials accompanying this paper appear online.

Keywords: Bias reduction; Forest health; Generalised additive models; Smoothing; Spatial regression (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1007/s13253-023-00586-7

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