On the Matrix Condition of Phylogenetic Tree.

ABSTRACT: Phylogenetic comparative analyses use trees of evolutionary relationships between species to understand their evolution and ecology. A phylogenetic tree of n taxa can be algebraically transformed into an n by n squared symmetric phylogenetic covariance matrix C where each element cij in C represents the affinity between extant species i and extant species j. This matrix C is used internally in several comparative methods: for example, it is often inverted to compute the likelihood of the data under a model. However, if the matrix is ill-conditioned (ie, if κ , defined by the ratio of the maximum eigenvalue of C to the minimum eigenvalue of C , is too high), this inversion may not be sta

SUBMITTER: Jhwueng DC 

PROVIDER: S-EPMC7019399 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature