dist_pres_vs_bg: Distance between the distribution of climate values for...

In tidysdm: Species Distribution Models with Tidymodels

Distance between the distribution of climate values for presences vs background

Description

For each environmental variable, this function computes the density functions of presences and absences and returns (1-overlap), which is a measure of the distance between the two distributions. Variables with a high distance are good candidates for SDMs, as species occurrences are confined to a subset of the available background.

Usage

dist_pres_vs_bg(.data, .col)

Arguments

.data	a data.frame (or derived object, such as tibble, or sf) with values for the bioclimate variables for presences and background
.col	the column containing the presences; it assumes presences to be the first level of this factor

Value

a name vector of distances

Examples

# This should be updated to use a dataset from tidysdm
data("bradypus", package = "maxnet")
bradypus_tb <- tibble::as_tibble(bradypus) %>%
  dplyr::mutate(presence = relevel(
    factor(
      dplyr::case_match(presence, 1 ~ "presence", 0 ~ "absence")
    ),
    ref = "presence"
  )) %>%
  select(-ecoreg)

bradypus_tb %>% dist_pres_vs_bg(presence)

tidysdm documentation built on April 3, 2025, 9:56 p.m.