Link parsers

Functions to parse the link (or inverse link) from a word to a function

Usage

parse_link(link_name)

parse_inv_link(link_name)

parse_deriv_link(link_name)

Arguments

link_name

The name of the link or a function.

Value

A function corresponding to the link_name.

Details

The following are valid link names:

identity

The function f(x) = x.with inverse finv(x) = x

logit

The function f(x) = ln(x / (1 - x)) with inverse finv(x) = 1 / (1 + exp(-x))

log-complement

The function f(x) = ln(1 - x) with inverse finv(x) = 1 - exp(x)

hawkins

The function f(x) = ln(x + sqrt(x^2 + 1)) with inverse finv(x) = 0.5 * exp(-x) * (exp(2 * x) - 1)

exponential

The function f(x) = exp(x) with inverse f(x) = ln(x)

Note

If a function is supplied to link_name the same function is returned

See also

linkfuns and inv_linkfuns