5 papers
How far are -dimensional copulas with uniform -marginals from (total) independence?
Damjana Kokol Bukovšek, Nik Stopar, Wolfgang Trutschnig
We consider the family of all -dimensional copulas whose -dimensional marginals are all equal to the -dimensional product copula $Π_{d-…
Discrete imprecise copulas and alternating sign matrices
Tomaž Košir, Elisa Perrone, Nik Stopar
In this paper, we study discrete quasi-copulas and discrete imprecise copulas of minimal range, which naturally correspond to alternating sign matrices. We show that this family is…
Unital compressed commuting graph of matrices over a finite prime field
Ivan-Vanja Boroja, Damjana Kokol Bukovšek, Nik Stopar
In this paper we completely describe the unital compressed commuting graph of the ring of matrices over the finite prime field $\mathrm…
The exact region determined by Spearman's footrule, Gini's gamma and Kendall's tau
Damjana Kokol BukovÅ¡ek, Petra LaziÄ, Blaž MojÅ¡kerc +1
Concordance measures are used to express the degree of association between random variables. Practitioners may use several distinct concordance measures to narrow the space of poss…
Freedom in constructing quasi-copulas vs. copulas
Matjaž OmladiÄ, Nik Stopar
The main goal of this paper is to study the extent of freedom one has in constructing quasi-copulas vs. copulas. Specifically, it exhibits three construction methods for quasi-copu…