Link and inverse-link functions for a fitted model

Every glm() family already carries its link and inverse-link functions (stats::family(mod)$linkfun / stats::family(mod)$linkinv), but many users don't realise these are available for the taking. erglm_link() and erglm_invlink() are thin, discoverable wrappers around them: erglm_link() maps the response scale to the linear predictor scale, and erglm_invlink() maps the linear predictor scale back to the response scale.

Usage

erglm_link(mod)

erglm_invlink(mod)

Arguments

mod

A fitted model, typically an erglm_model/glm object.

Value

A function of one numeric-vector argument.

Examples

mod <- erglm_model(ae1 ~ aucss + sex, erglm_data, family = binomial())
erglm_link(mod)(0.5)
#> [1] 0
erglm_invlink(mod)(0)
#> [1] 0.5
erglm_link(mod)(erglm_invlink(mod)(-2:2))
#> [1] -2 -1  0  1  2