30 citations · 169 across the 28 of their papers we have counts for
3 papers · 1 filter
Total positivity in Markov structures
Shaun Fallat, Steffen Lauritzen, Kayvan Sadeghi +3
We discuss properties of distributions that are multivariate totally positive of order two (MTP2) related to conditional independence. In particular, we show that any independence…
The correlation space of Gaussian latent tree models and model selection without fitting
Nathaniel Shiers, Piotr Zwiernik, John A. D. Aston +1
We provide a complete description of possible covariance matrices consistent with a Gaussian latent tree model for any tree. We then present techniques for utilising these constrai…
Automorphism groups of Gaussian chain graph models
Piotr Zwiernik, Jan Draisma
In this paper we extend earlier work on groups acting on Gaussian graphical models to Gaussian Bayesian networks and more general Gaussian models defined by chain graphs. We discus…