Academic staff at the Department of Mathematical Sciences – University of Copenhagen

Markov properties for mixed graphs

Research output: Contribution to journalJournal articleResearchpeer-review

Kayvan Sadeghi Sadeghi, Steffen L. Lauritzen

In this paper, we unify the Markov theory of a variety of different types of graphs used in graphical Markov models by introducing the class of loopless mixed graphs, and show that all independence models induced by m-separation on such graphs are compositional graphoids. We focus in particular on the subclass of ribbonless graphs which as special cases include undirected graphs, bidirected graphs, and directed acyclic graphs, as well as ancestral graphs and summary graphs. We define maximality of such graphs as well as a pairwise and a global Markov property. We prove that the global and pairwise Markov properties of a maximal ribbonless graph are equivalent for any independence model that is a compositional graphoid.
Original languageEnglish
Issue number2
Pages (from-to)676-696
StatePublished - 2014
Externally publishedYes

ID: 128107826