Author

M. S. Çadırcı

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Preprint Sep 2026

Bootstrap-Calibrated Spectral Divergence Tests for Online Detection of Covariance Matrix Changes

A covariance matrix rarely distorts in a single direction: a shift can expand all variances simultaneously, shift variance along one or two principal directions, displace spectral mass without changing marginal means, or rotate the dependence structure. Default mean-shift detectors are blind to these effects, and no ex...

M. S. Çadırcı, M. Singull · 0 citations

Preprint Sep 2026

Entropy-Based Goodness-of-Fit Tests for Generalized $\kappa$ -Gaussian Distributions

We introduce this class of multivariate Kappa-Gaussian distributions by maximizing a type of Kaniadakis $\kappa$ entropy subject to certain first- and second-moment constraints. This differs slightly from the approach of R\'enyi and Tsallis, because the $\kappa$-entropy arises from a relativity-consistent deformation o...

M. S. Çadırcı, K. Zografos · 0 citations