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- Megan Owen, J. Scott Provan
- IEEE/ACM Transactions on Computational Biology…
- 2011

Comparing and computing distances between phylogenetic trees are important biological problems, especially for models where edge lengths play an important role. The geodesic distance measure between two phylogenetic trees with edge lengths is the length of the shortest path between them in the continuous tree space introduced by Billera, Holmes, and… (More)

- Aasa Feragen, Megan Owen, +4 authors Marleen de Bruijne
- IPMI
- 2013

Statistical analysis of anatomical trees is hard to perform due to differences in the topological structure of the trees. In this paper we define statistical properties of leaf-labeled anatomical trees with geometric edge attributes by considering the anatomical trees as points in the geometric space of leaf-labeled trees. This tree-space is a geodesic… (More)

- Aasa Feragen, Jens Petersen, +5 authors Marleen de Bruijne
- MICCAI
- 2012

We present a fast and robust supervised algorithm for labeling anatomical airway trees, based on geodesic distances in a geometric tree-space. Possible branch label configurations for a given tree are evaluated based on distances to a training set of labeled trees. In tree-space, the tree topology and geometry change continuously, giving a natural way to… (More)

- Ezra Miller, Megan Owen, J. Scott Provan
- ArXiv
- 2012

The diversity of species is related to the separation of gene pools over evolutionary time. In this process two or more lineages often stay closely associated with one another: genes with species and hosts with symbionts (parasites or mutualists). The concept of codivergence, the divergence of one lineage (species or gene) as a result of the divergence of… (More)

This paper investigates the computational geometry relevant to calculations of the Fréchet mean and variance for probability distributions on the phylogenetic tree space of Billera, Holmes and Vogtmann, using the theory of probability measures on spaces of nonpositive curvature developed by Sturm. We show that the combinatorics of geodesics with a specified… (More)

- Megan Owen
- SIAM J. Discrete Math.
- 2011

We present two algorithms for computing the geodesic distance between phylogenetic trees in tree space, as introduced by Billera, Holmes, and Vogtmann (2001). We show that the possible combinatorial types of shortest paths between two trees can be compactly represented by a partially ordered set. We calculate the shortest distance along each candidate path… (More)

- Dennis Barden, Huiling Le, Megan Owen
- 2013

J o u r n a l o f P r o b a b i l i t y Electron. Abstract This paper studies the characterisation and limiting distributions of Fréchet means in the space of phylogenetic trees. This space is topologically stratified, as well as being a CAT (0) space. We use a generalised version of the Delta method to demonstrate non-classical behaviour arising from the… (More)

- Federico Ardila, Megan Owen, Seth Sullivant
- ArXiv
- 2011

We describe an algorithm to compute the geodesics in an arbitrary CAT(0) cubical complex. A key tool is a correspondence between cubical complexes of global non-positive curvature and posets with inconsistent pairs. This correspondence also gives an explicit realization of such a complex as the state complex of a reconfigurable system, and a way to embed… (More)

- Sean Skwerer, Elizabeth Bullitt, +6 authors J. S. Marron
- Journal of Mathematical Imaging and Vision
- 2013

Statistical analysis of magnetic resonance angiography (MRA) brain artery trees is performed using two methods for mapping brain artery trees to points in phylogenetic treespace: cortical landmark correspondence and descendant correspondence. The differences in end-results based on these mappings are highlighted to emphasize the importance of correspondence… (More)