Generate a Power Link Object

DESCRIPTION:

Creates a parametrized link subfamily with up to five components: name, link , inverse , deriv , and initialize. The value of each component depends on the value of lambda.

USAGE:

power(lambda=1) 

OPTIONAL ARGUMENTS:

lambda
The power parameter, which can be any numeric value (typically within 3 units of zero).

VALUE:

A power link object, which is a list of functions and expressions. Type power() for an example. The value 0 for lambda is a limiting case, and results in the log link function; power detects this situation.

DETAILS:

If lambda is less than zero, it is taken as zero (implies log link).

SEE ALSO:

, , , .

EXAMPLES:

glm(formula, family=quasi(link=power(1/3))) 
quasi(link=power(1/3)) 
quasi(link = power(0))[c("name","link","inverse","deriv","initialize")]