Abstract
Graphical models (GMs) are powerful statistical tools for modeling the (in)dependencies among random variables. In this paper, we focus on two different types of graphical models: R-vines and polytrees. Regarding the graphical representation of these models, the former uses a sequence of undirected trees with edges representing pairwise dependencies, whereas the latter uses a directed graph without cycles to encode independence relationships among the variables. The research problem we deal with is whether it is possible to build an R-vine that represents the largest number of independencies found in a polytree and vice versa. Two algorithms are proposed to solve this problem. One algorithm is used to induce an R-vine that represents in each tree the largest number of graphical independencies existing in a polytree. The other one builds a polytree that represents all the independencies found in the R-vine. Through simple examples, both procedures are illustrated.
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Notes
- 1.
We assume that all multivariate, marginal and conditional distributions are absolutely continuous with corresponding densities.
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Acknowledgements
The author would like to thank Dr. Aritz Perez, of Basque Center for Applied Mathematics, BCAM, 48009 Bilbao, Spain, for valuable comments and suggestions. This work is partially supported by the Basque Government (IT609-13 and Elkartek), and Spanish Ministry of Science and Innovation (TIN2016-78365-R). Jose A. Lozano is also supported by BERC 2014–2017 and Elkartek programs (Basque government) and Severo Ochoa Program SEV-2013-0323 (Spanish Ministry of Economy and Competitiveness).
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Carrera, D., Santana, R., Lozano, J.A. (2018). The Relationship Between Graphical Representations of Regular Vine Copulas and Polytrees. In: Medina, J., Ojeda-Aciego, M., Verdegay, J., Perfilieva, I., Bouchon-Meunier, B., Yager, R. (eds) Information Processing and Management of Uncertainty in Knowledge-Based Systems. Applications. IPMU 2018. Communications in Computer and Information Science, vol 855. Springer, Cham. https://doi.org/10.1007/978-3-319-91479-4_56
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