entropy_j {treestats} | R Documentation |
The intensive quadratic entropy statistic J is given by the average distance between two randomly chosen species, thus given by the sum of all pairwise distances, divided by S^2, where S is the number of tips of the tree.
entropy_j(phy)
phy |
phylo object or ltable |
intensive quadratic entropy statistic J
Izsák, János, and Laszlo Papp. "A link between ecological diversity indices and measures of biodiversity." Ecological Modelling 130.1-3 (2000): 151-156.