# balance

From ape v2.1-1
by Emmanuel Paradis

##### Balance of a Dichotomous Phylogenetic Tree

This function computes the balance of a phylogenetic tree, that is for each node of the tree the numbers of descendants (i.e. tips) on each of its daughter-branch. The tree must be fully dichotomous.

- Keywords
- manip

##### Usage

`balance(phy)`

##### Arguments

- phy
- an object of class
`"phylo"`

.

##### Value

- a numeric matrix with two columns and one row for each node of the
tree. The columns give the numbers of descendants on each
daughter-branches (the order of both columns being arbitrary). If the
phylogeny
`phy`

has an element`node.label`

, this is used as rownames for the returned matrix; otherwise the numbers (of mode character) of the matrix`edge`

of`phy`

are used as rownames.

##### References

Aldous, D. J. (2001) Stochastic models and descriptive statistics for
phylogenetic trees, from Yule to today. *Statistical Science*,
**16**, 23--34.

*Documentation reproduced from package ape, version 2.1-1, License: GPL (>= 2)*

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