power
Generate a Power Link Object

### Description

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

### Usage

    power(lambda = 1)

### Arguments

lambda | a numeric value that specifies the power parameter, (typically within three units of zero). The NA value is not allowed.

### Details

If lambda is less than zero, it is taken as zero (implies log link).
Value
a power link object with class attribute "link-glm", which is a list of functions and expressions, including

linkfun
linkinv
mu.eta
valideta
name

See the family.object help file for a description of the components.
The value of lambda less than or equal to 0 is a limiting case, and results in the log link function. The value 1 for lambda will return the identity link function.
See Also
make.link, glm, family, family.object.
Examples

    quasi(link = power(1/4))
    quasi(link = power(0))[c("family", "link", "linkfun", "linkinv")]

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