R: Create a Link for GLM families

make.link {stats}

R Documentation

Create a Link for GLM families

Description

This function is used with the family functions in glm(). Given a link, it returns a link function, an inverse link function, the derivative dmu/deta and a function for domain checking.

Usage

make.link(link)

Arguments

link character or numeric; one of "logit", "probit", "cloglog", "identity", "log", "sqrt", "1/mu^2", "inverse", or (deprecated) a non-negative number, say lambda resulting in power link mu ^ lambda. Also (deprecated) a string like "power(0.5)" to indicate a call to power.

Value

A object of class "link-glm", a list with components

`linkfun`	Link function `function(mu)`
`linkinv`	Inverse link function `function(eta)`
`mu.eta`	Derivative `function(eta)` dmu/deta
`valideta`	`function(eta)`{ `TRUE` if `eta` is in the domain of `linkinv` }.
`name`	a name to be used for the link

Examples

str(make.link("logit"))