Description Usage Arguments Value References Examples
This calculates M (as defined in Pompei et al., 2012), a measure of asymmetry based on the topological distance, M_i, between tip i and the root:
M = \frac{1}{N} ∑_{i \in \mathcal{L}} {M_i}.
This is equivalent to Sackin's index divided by the number of tips (also known as the normalised Sackin index). See also sackin
1 | M(tree)
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tree |
A tree of class |
An object of class numeric
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Pompei S, Loreto V, Tria F (2012) Phylogenetic Properties of RNA Viruses. PLoS ONE 7(9): e44849. doi:10.1371/journal.pone.0044849
Sackin MJ (1972) Good and bad phenograms. Systematic Biology 21: 225-226.
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