loglik_niche: Negative log likelihood of an ellipsoid corrected with...

In xnicher: Estimates Ecological Niche Models Using Ellipses

Negative log likelihood of an ellipsoid corrected with environmental combinations which come from the area of study (M)

Description

Negative log likelihood of an ellipsoid corrected with environmental combinations which come from the area of study (M)

Usage

loglik_niche(mu, s_mat, env_occ, env_m, neg = TRUE)

Arguments

mu	A vector mu of parameters
s_mat	The covariance matrix from environmental data frame
env_occ	A data.frame containing the original sample of environmental combinations that correspond to presences
env_m	A data.frame containing a second random sample of environmental
neg	Logical. Default TRUE, returns the negative of the likelihood

Value

A negative log likelihood value

Examples

loglik_niche(
  mu = example_mu_vec,
  s_mat = example_s_mat,
  env_occ = example_env_occ_2d,
  env_m = example_env_m_2d
)
# Example with log of the likelihood
loglik_niche(
  mu = example_mu_vec,
  s_mat = example_s_mat,
  env_occ = example_env_occ_2d,
  env_m = example_env_m_2d,
  neg = FALSE
)

xnicher documentation built on Sept. 15, 2026, 5:08 p.m.