View source: R/restrictedness.R
restrictedness_stack | R Documentation |
Compute the geographical restrictedness for each species present in the
stacked data.frame. Geographical restrictedness is an index related to the
extent of a species in a given dataset, it is close to 1 when the species is
present in only a single site of the dataset (restricted) and close to 0 when
the species is present at all sites. It estimates the geographical extent of
a species in a dataset. See restrictedness()
for details
on restrictedness computation. You can either use _stack()
or _tidy()
functions as they are aliases of one another.
restrictedness_stack(com_df, sp_col, com, relative = FALSE) restrictedness_tidy(com_df, sp_col, com, relative = FALSE)
com_df |
a stacked (= tidy) data.frame of communities |
sp_col |
a character vector indicating the name of the species column |
com |
a character vector indicating the name of the community column |
relative |
a logical (default = FALSE), indicating if restrictedness should be computed relative to restrictedness from a species occupying a single site |
A stacked data.frame containing species' names and their
restrictedness value in the Ri column, similar to what
uniqueness_stack()
returns.
restrictedness()
, uniqueness_stack()
data("aravo", package = "ade4") # Site-species matrix converted into data.frame mat = as.matrix(aravo$spe) dat = matrix_to_stack(mat, "value", "site", "species") dat$site = as.character(dat$site) dat$species = as.character(dat$species) ri_df = restrictedness_stack(dat, "species", "site") head(ri_df)
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