make.link               package:stats               R Documentation

Create a Link for GLM Families

Description:

     This function is used with the 'family' functions in 'glm()'.
     Given the name of 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"',
          '"cauchit"', '"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

     .

See Also:

     'power', 'glm', 'family'.

Examples:

     utils::str(make.link("logit"))

