Author

Christopher J. Geoga

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Preprint Sep 2026

Bigraphical Mat\'ern-Whittle (BMW) Processes for Fast Inference of Big Multivariate Spatial Data on General Domains

Large spatial data sets now record many correlated variables at many thousands of locations, often on domains where Euclidean distance misrepresents proximity. The central difficulty is modelling the cross-variable dependence jointly while retaining variable-level interpretation. We introduce the bigraphical Mat'ern-Wh...

D. Dey, Alokesh Manna, Christopher J. Geoga · 1 citation

Preprint Aug 2026

Linear-cost Polyharmonic Spline Interpolation of Arbitrary Degree

We introduce a simple and performant approach for rapidly and accurately performing polyharmonic spline (PHS) interpolation using a combination of the fast multipole method (FMM) from computational electrostatics and the Vecchia approximation from the Gaussian process and sparse approximate inverse literatures. Using b...

Christopher J. Geoga, Michael O’Neil · 0 citations