3 \title{Topological Distances Between Two Trees}
5 dist.topo(x, y, method = "PH85")
8 \item{x}{an object of class \code{"phylo"}.}
9 \item{y}{an object of class \code{"phylo"}.}
10 \item{method}{a character string giving the method to be used: either
11 \code{"PH85"}, or \code{"score"}.}
14 This function computes the topological distance between two
15 phylogenetic trees using different methods.
18 a single numeric value.
21 Two methods are available: the one by Penny and Hendy (1985), and the
22 branch length score by Kuhner and Felsenstein (1994).
24 The topological distance is defined as twice the number of internal
25 branches defining different bipartitions of the tips (Penny and Hendy
26 1985). Rzhetsky and Nei (1992) proposed a modification of the original
27 formula to take multifurcations into account.
29 The branch length score may be seen as similar to the previous
30 distance but taking branch lengths into account. Kuhner and
31 Felsenstein (1994) proposed to calculate the square root of the sum of
32 the squared differences of the (internal) branch lengths defining
33 similar bipartitions (or splits) in both trees.
36 The geodesic distance of Billera et al. (2001) has been disabled.
39 Billera, L. J., Holmes, S. P. and Vogtmann, K. (2001) Geometry of the
40 space of phylogenetic trees. \emph{Advances in Applied Mathematics},
43 Kuhner, M. K. and Felsenstein, J. (1994) Simulation comparison of
44 phylogeny algorithms under equal and unequal evolutionary rates.
45 \emph{Molecular Biology and Evolution}, \bold{11}, 459--468.
47 Nei, M. and Kumar, S. (2000) \emph{Molecular evolution and
48 phylogenetics}. Oxford: Oxford University Press.
50 Penny, D. and Hendy, M. D. (1985) The use of tree comparison
51 metrics. \emph{Systemetic Zoology}, \bold{34}, 75--82.
53 Rzhetsky, A. and Nei, M. (1992) A simple method for estimating and
54 testing minimum-evolution trees. \emph{Molecular Biology and
55 Evolution}, \bold{9}, 945--967.
57 \author{Emmanuel Paradis \email{Emmanuel.Paradis@mpl.ird.fr}}
59 \code{\link{read.tree}} to read tree files in Newick format,
60 \code{\link{cophenetic.phylo}}, \code{\link{prop.part}}
65 dist.topo(ta, ta) # = 0
66 dist.topo(ta, tb) # This is unlikely to be 0 !