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math.ST2026
The Fisher score on the closed simplex
Giovanni Pistone, Fabio Rapallo, Eva Riccomagno
We extend classical analytic tools for finite-state statistical models to allow zero probabilities. Using methods from algebraic statistics and information geometry, we develop a f…
math.ST2025
Zero patterns in multi-way binary contingency tables with uniform margins
Roberto Fontana, Elisa Perrone, Fabio Rapallo
We study the problem of transforming a multi-way contingency table into an equivalent table with uniform margins and same dependence structure. This is an old question which relate…