5 papers
Random discrete copulas
Damjana Kokol Bukovšek, Blaž Mojškerc, Nik Stopar
We introduce the notion of a bivariate random discrete copula on an equidistant mesh and explore its stochastic properties. A random discrete copula is a discrete random field, hen…
Compressed commuting graphs of matrix rings
Ivan-Vanja Boroja, Hamid Reza Dorbidi, Damjana Kokol Bukovšek +1
In this paper we introduce compressed commuting graph of rings. It can be seen as a compression of the standard commuting graph (with the central elements added) where we identify…
Symmetric Nonnegative Matrix Trifactorization
Damjana Kokol Bukovšek, Helena Šmigoc
The Symmetric Nonnegative Matrix Trifactorization (SN-Trifactorization) is a factorization of an nonnegative symmetric matrix of the form , where is a $…
Completely positive factorizations associated with Euclidean distance matrices corresponding to an arithmetic progression
Damjana Kokol Bukovšek, Thomas Laffey, Helena Šmigoc
Euclidean distance matrices corresponding to an arithmetic progression have rich spectral and structural properties. We exploit those properties to develop completely positive fact…
Relation between non-exchangeability and measures of concordance of copulas
Damjana Kokol Bukovšek, Tomaž Košir, Blaž Mojškerc +1
An investigation is presented of how a comprehensive choice of five most important measures of concordance (namely Spearman's rho, Kendall's tau, Gini's gamma, Blomqvist's beta, an…