Expected length of pendant and interior edges of a Yule tree

Details Expected length of pendant and interior edges of a Yule tree Expected length of pendant and interior edges of a Yule tree

2009-10-27

arxiv.org/abs/0910.5240v1

Biology

Quantitative Biology

Populations and Evolution

6 pages, 1 figure

Scientific paper

The Yule (pure-birth) model is the simplest null model of speciation; each lineage gives rise to a new lineage independently with the same rate $\lambda$. We investigate the expected length of an edge chosen at random from the resulting evolutionary tree. In particular, we compare the expected length of a randomly selected edge with the expected length of a randomly selected pendant edge. We provide some exact formulae, and show how our results depend slightly on whether the depth of the tree or the number of leaves is conditioned on, and whether $\lambda$ is known or is estimated using maximum likelihood.

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