5 papers
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…
Characterization of multi-way binary tables with uniform margins and fixed correlations
Roberto Fontana, Elisa Perrone, Fabio Rapallo
In many applications involving binary variables, only pairwise dependence measures, such as correlations, are available. However, for multi-way tables involving more than two varia…
How many outbreaks before an epidemic?
Fabio Rapallo, Enrico Scalas, Pietro Terna
In this work, we study the finite-population behaviour of the Reed-Frost epidemic model. Our analysis relies on the exact expression for the final epidemic size, replaced by Monte…
Testing for a common subspace in compositional datasets with structural zeros
Francesco Porro, Fabio Rapallo, Sara Sommariva
In this paper, we consider the problem of testing for a common principal subspace in compositional datasets with structural zeros. In particular, we address the problem in the gene…
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…