make.link {stats} | R Documentation |
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.
make.link(link)
link |
character or numeric; one of "logit" ,
"probit" , "cloglog" , "identity" ,
"log" , "sqrt" , "1/mu^2" ,
"inverse" , or number, say lambda resulting
in power link mu ^ lambda. |
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 all of
eta is in the domain of linkinv }. |
str(make.link("logit")) l2 <- make.link(2) l2$linkfun(0:3)# 0 1 4 9 l2$mu.eta(eta= 1:2)#= 1/(2*sqrt(eta))