Presenter: Lucas da Cunha Godoy, Postdoctoral scholar in the Ecology and Environmental Biology Department, University of California Santa Cruz

Description: Accurate modeling of spatial dependence is pivotal in analyzing spatial data, influencing parameter estimation and predictions. The spatial structure of the data significantly impacts valid statistical inference. Existing models for areal data often rely on adjacency matrices, struggling to differentiate between polygons of varying sizes and shapes. Conversely, data fusion models rely on computationally intensive numerical integrals, presenting challenges for moderately large datasets. In response to these issues, we propose the Hausdorff-Gaussian process (HGP), a versatile model utilizing the Hausdorff distance to capture spatial dependence in both point and areal data. We introduce a valid correlation function for this model, accommodating diverse modeling techniques, including geostatistical and areal models. Integration into generalized linear mixed-effects models enhances its applicability, particularly in addressing data fusion challenges. We validate our approach through a comprehensive simulation study and application to two real-world scenarios involving areal data, and another demonstrates its effectiveness in data fusion. The results suggest that the HGP is competitive with specialized models regarding goodness-of-fit and prediction performances. In summary, the HGP offers a flexible and robust solution for modeling spatial data of various types and shapes, with potential applications spanning fields such as public health and climate science.

Bio: Lucas da Cunha (it reads Cunya, the sound is similar to ñ in Piña Colada) Godoy recently completed his PhD in Statistics at the University of Connecticut. He is a postdoctoral scholar in the Ecology and Environmental Biology Department at the University of California Santa Cruz. Originally from Brazil, Lucas's research focuses on spatial statistics, Bayesian inference, and computational statistics, with a passion for applying these tools to environmental challenges.

Location: JBEB 156