Returns the link-function from a model object.
Usage
link_function(x, ...)
# S3 method for class 'betamfx'
link_function(x, what = c("mean", "precision"), ...)
# S3 method for class 'gamlss'
link_function(x, what = c("mu", "sigma", "nu", "tau"), ...)
# S3 method for class 'betareg'
link_function(x, what = c("mean", "precision"), ...)
# S3 method for class 'DirichletRegModel'
link_function(x, what = c("mean", "precision"), ...)
Arguments
- x
A fitted model.
- ...
Currently not used.
- what
For gamlss models, indicates for which distribution
parameter the link (inverse) function should be returned; for
betareg or DirichletRegModel, can be "mean" or
"precision".
Value
A function, describing the link-function from a model-object.
For multivariate-response models, a list of functions is returned.
Examples
# example from ?stats::glm
counts <- c(18, 17, 15, 20, 10, 20, 25, 13, 12)
outcome <- gl(3, 1, 9)
treatment <- gl(3, 3)
m <- glm(counts ~ outcome + treatment, family = poisson())
link_function(m)(0.3)
#> [1] -1.203973
# same as
log(0.3)
#> [1] -1.203973
