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29 lip 2011 · Given the Euclidean nature of the elementwise square root of phylogenetic distance matrices, the positive semidefinitiveness of the phylogenetic variance–covariance matrix of a trait following a BM model, or related models of trait evolution, can be established.
Distance matrices are used in phylogeny as non-parametric distance methods and were originally applied to phenetic data using a matrix of pairwise distances. These distances are then reconciled to produce a tree (a phylogram, with informative branch lengths).
9 mar 2011 · CADM is a statistical test used to estimate the level of Congruence Among Distance Matrices. It has been shown in previous studies to have a correct rate of type I error and good power when applied to dissimilarity matrices and to ultrametric distance matrices.
19 paź 2016 · Significant results in the standard Mantel test show that the phylogenetic distances are related with the distances based on species traits, but do not distinguish such association from that expected given an evolutionary model of trait evolution.
6 lip 2018 · This chapter is on distance-based phylogenetic reconstruction and dating. For the first objective, we need a distance matrix and a tree-building algorithm making use of the distance matrix. For dating, we need calibration points to convert branch lengths to geological time.
10 kwi 2012 · Phylogenetic signal is the tendency of related species to resemble each other more than species drawn at random from the same tree. This pattern is of considerable interest in a range of ecological and evolutionary research areas, and various indices have been proposed for quantifying it.
Large distances are underestimated by raw counts. A mutational model allows corrected distances. Jukes-Cantor model: D = 3 4 ln (1 4 3 Ds) D is the corrected distance (what we want) Dsis the raw count (what we have) ln is the natural log. Mutational models for DNA.
