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stat.ME2026
Modelling compositional data with structural zero values
Omar Alzeley, Michail Tsagris
Compositional data are positive multivariate data whose sum equals 1. A popular method to analyze such data is via log--ratio transformations, which are however not applicable when…
stat.ME2025
Scalable approximation of the transformation-free linear simplicial-simplicial regression via constrained iterative reweighted least squares
Michail Tsagris, Omar Alzeley
Simplicia-simplicial regression concerns statistical modeling scenarios in which both the predictors and the responses are vectors constrained to lie on the simplex. \cite{fiksel20…
stat.ME2023
Circular and Spherical Projected Cauchy Distributions: A Novel Framework for Circular and Directional Data Modeling
Michail Tsagris, Omar Alzeley
We introduce a novel family of projected distributions on the circle and the sphere, namely the circular and spherical projected Cauchy distributions, as promising alternatives for…