colless_quad {treestats} | R Documentation |
Quadratic Colless index of (im)balance.
Description
The Quadratic Colless index is calculated as the sum of
(L - R)^2
over all nodes.
Usage
colless_quad(phy, normalization = "none")
Arguments
phy |
phylo object or ltable |
normalization |
A character string equals to "none" (default) for no normalization or "yule" |
Value
quadratic colless index
References
Bartoszek, Krzysztof, et al. "Squaring within the Colless index yields a better balance index." Mathematical Biosciences 331 (2021): 108503.
Examples
simulated_tree <- ape::rphylo(n = 10, birth = 1, death = 0)
balanced_tree <- treestats::create_fully_balanced_tree(simulated_tree)
unbalanced_tree <- treestats::create_fully_unbalanced_tree(simulated_tree)
colless_quad(balanced_tree)
colless_quad(unbalanced_tree) # should be higher
[Package treestats version 1.70.4 Index]