Dice-Sorensen Qualitative Index
index_sorensen(x, y, ...)# S4 method for logical,logical
index_sorensen(x, y)
# S4 method for numeric,numeric
index_sorensen(x, y)
A numeric vector.
A numeric vector.
Currently not used.
N. Frerebeau
Data are standardized on a presence/absence scale (\(0\)/\(1\)) beforehand.
Dice, L. R. (1945). Measures of the Amount of Ecologic Association Between Species. Ecology, 26(3): 297-302. tools:::Rd_expr_doi("10.2307/1932409")
Sorensen, T. (1948). A Method of Establishing Groups of Equal Amplitude in Plant Sociology Based on Similarity of Species Content and Its Application to Analyses of the Vegetation on Danish Commons. Kongelige Danske Videnskabernes Selskab, 5(4): 1-34.
Other beta diversity measures:
index_binomial(),
index_brainerd(),
index_bray(),
index_cody(),
index_jaccard(),
index_morisita(),
index_routledge,
index_whittaker(),
index_wilson()