More taxa are not necessarily better for the reconstruction of ancestral character states.

@article{Li2008MoreTA,
  title={More taxa are not necessarily better for the reconstruction of ancestral character states.},
  author={Guoliang Li and Mike Steel and Louxin Zhang},
  journal={Systematic biology},
  year={2008},
  volume={57 4},
  pages={647-53}
}
Given the phylogenetic tree for a group of species, we assume that the character evolves by a Markov process, starting with a state at the root and proceeding to the leaves node by node. The probability that a node x receives a state tx depends only on its parent node p and the conditions along the branch from p to x. The evolutionary model specifies the probability that state c evolves to state d on a branch from p to x as a conditional probability Pr[sx = d|sp = c]. Here, we consider a simple… CONTINUE READING

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