| psv {treestats} | R Documentation |
Phylogenetic Species Variability.
Description
The phylogenetic species variability is bounded in [0, 1]. The psv quantifies how phylogenetic relatedness decrease the variance of a (neutral) trait shared by all species in the tree. As species become more related, the psv tends to 0. Please note that the psv is a special case of the Mean Pair Distance (see appendix of Tucker et al. 2017 for a full derivation), and thus correlates directly.
Usage
psv(phy, normalization = "none")
Arguments
phy |
phylo object or ltable |
normalization |
"none" or "tips", in which case the obtained mean pairwise distance is normalized by the factor 2log(n), where n is the number of tips. |
Value
Phylogenetic Species Variability
References
Helmus M.R., Bland T.J., Williams C.K. & Ives A.R. (2007) Phylogenetic measures of biodiversity. American Naturalist, 169, E68-E83
Tucker, Caroline M., et al. "A guide to phylogenetic metrics for conservation, community ecology and macroecology." Biological Reviews 92.2 (2017): 698-715.