CladisticInfo() calculates the cladistic (phylogenetic) information
content of a phylogenetic object, sensu Thorley et al. (1998).
CladisticInfo(x)PhylogeneticInfo(x)
# S3 method for phylo
CladisticInfo(x)
# S3 method for Splits
CladisticInfo(x)
# S3 method for list
CladisticInfo(x)
# S3 method for multiPhylo
CladisticInfo(x)
PhylogeneticInformation(x)
CladisticInformation(x)
CladisticInfo() returns a numeric giving the cladistic information
content of the input tree(s), in bits.
If passed a Splits object, it returns the information content of each
split in turn.
Tree of class phylo, or a list thereof.
The CIC is the logarithm of the number of binary trees that include the specified topology. A base two logarithm gives an information content in bits.
The CIC was originally proposed by Rohlf1982;textualTreeTools, and formalised, with an information-theoretic justification, by Thorley1998;textualTreeTools. Steel2006;textualTreeTools term the equivalent quantity "phylogenetic information content" in the context of individual characters.
The number of binary trees consistent with a cladogram provides a more satisfactory measure of the resolution of a tree than simply counting the number of edges resolved Page1992TreeTools.
Other tree information functions:
NRooted(),
TreesMatchingTree()
Other tree characterization functions:
Consensus(),
J1Index(),
Stemwardness,
TotalCopheneticIndex()