The conditioned reconstructed process

Details The conditioned reconstructed process The conditioned reconstructed process

2008-03-02

arxiv.org/abs/0803.0153v1

Mathematics

Probability

Scientific paper

We investigate a neutral model for speciation and extinction, the constant rate birth-death process. The process is conditioned to have $n$ extant species today, we look at the tree distribution of the reconstructed trees-- i.e. the trees without the extinct species. Whereas the tree shape distribution is well-known and actually the same as under the pure birth process, no analytic results for the speciation times were known. We provide the distribution for the speciation times and calculate the expectations analytically. This characterizes the reconstructed trees completely. We will show how the results can be used to date phylogenies.

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